List Of Curtas

How old is your Curta relative to the others on the list? Do you have a serial number incrementally next to someone else on the list? Is your Curta the oldest known of either a Type I or a Type II? Is your Curta the newest known of either Type? Is your Curta's serial number a prime number? Is it one of a twin prime (the next prime number differs by only 2 counts)? Is the next one on the list the twin prime to yours? See http://www.utm.edu/research/primes/lists/small/

Below is an ordered listing of Curtas and their owners. The Curtas are listed in ascending numerical order using their serial numbers as the index.

You can add your name and your Curta's serial number to the list by clicking here --> [1] <-- or click the "Edit Text" link at the bottom of this page. You'll have to locate the position within the text where you want to place your entry, so just scroll down as needed in the editing window. Place your cursor after the name of the owner for the Curta that precedes your serial number, type a carriage return, insert a single blank space as a first character of the new line (immediately before your Curta's serial number), and finally type your Curta's serial number, your name, and where you live (if you wish). Insert dashes and spaces as in the other listings. Important...You must insert a single blank space as the first character of the new line. This puts your entry on a new line in the updated Curta list page, and aligns your information properly with that above and below. Also, if you normally use upper case letters somewhere in the middle of your name, please add a space before the "mid-word" upper case letters. Doing so will prevent a new Wiki page from automatically being formed. (See AddingNewPages for details.)

Due to improper use of this page for private purposes, you are now required to register with Curta.org if you wish to add your name and machine serial number to the owner's list. When you select the "Edit Text" link, you'll be asked to login or register. Follow the directions given to you and you'll be allowed to modify this and other Curta.org pages.

Or, if you prefer not to register, you can send your name, location, and the serial number of your Curta to mailto:curta.info@gmail.com using a subject something like "Add my name". The administrators of the Curta.org site will then update this list with your information.

All Type I's are listed first. According to documentation from the factory, the first production Curta was serial number 901. And the last factory produced Type I had serial number 80427. Type II serial numbers started at 500001 and continued up to 561660.

Factory documentation indicates that the last Type I officially produced by Contina was serial number 80427. Contina documentation also states that the last Type II officially produced was serial number 561660. When the factory doors closed, some workers were given enough parts to build complete machines. These Type I and Type II Curtas were assigned serial numbers higher than the highest factory documented units. These machines are true Curtas in every sense...they simply were built outside the factory facilities by the same people who assembled them within the factory.

To discover whether your Curta's serial number happens to be a prime number, go to: http://www.utm.edu/research/primes/lists/small/ or http://www.prime-numbers.org/

By the way, if you have a Curta Type I with serial number 8128, you have the only Curta manufactured with a "perfect number" as its serial number. (This assumes that Type I's with serial numbers 6, 28, and 496 (the only perfect numbers less than 8128) were never made. The next perfect number greater than 8128 is 33550336, and no Curta was made with such a high serial number.) For information on Perfect Numbers go to: http://primes.utm.edu/glossary/page.php?sort=PerfectNumber

TYPE I

  921 -- Hermann Hierhager (Germany)
  923 -- Cris Vande Velde (DE)
  962 -- CurtaLi (Switzerland) - "CONTINA", with prototype canister "CONTINA"
  968 -- Donald Rosen (USA)
  970 -- Johannes Schranz
  972 -- Mandi (Germany)
  978 -- Burkhard Pock  (Austria)
  979 -- beck
  996 -- beck
  998 -- beck 
 1905 -- Mandi (Germany)
 1980 -- CurtaLi (Switzerland)
 1983 -- TomsCollection (Switzerland) - needs some serious repairs
 2023 -- Mandi (Germany)
 2025 -- TomsCollection (Switzerland) - mint, clearing lever broken
 2033 -- Donald Rosen (USA)
 2044 -- Donald Rosen (USA)
 2049 -- Donald Rosen (USA)
 2059 -- Jaime Garcia Jimenez (Uruguay)
 2096 -- Paul Fiel
 2185 -- RickFurr (USA)
 2223 -- Donald Rosen (USA)
 2228 -- Shawn Styler (USA)
 2837 -- Frederic Deniaud (France)
 2880 -- Donald Rosen (USA)
 2881 -- Cris Vande Velde (DE)
 2891 -- Etienne Pommel (France)
 2938 -- Vincent Merlen (CAN)
 3008 -- Steve Englebrecht (USA)
 3047 -- JackChristensen (USA)
 3050 -- Donald Rosen (USA)
 3065 -- Geoffrey Cross
 3067 -- Claude Van Houtte
 3103 -- Des Harrison (New Zealand ex SA)
 3122 -- Samuel Sit (Hong Kong)
 3129 -- Donald Rosen (USA)
 3130 -- CurtaLi (Switzerland)
 3186 -- Donald Rosen (USA)
 3205 -- TomsCollection (Switzerland)
 3225 -- Donald Rosen (USA)
 3234 -- Daniel Lewin
 3275 -- Donald Rosen (USA)
 3342 -- Charles Knowles (UK)
 3392 -- Charles Walters (UK)
 3404 -- Hermann Hierhager (Germany)
 3438 -- Steve Englebrecht (USA)
 3488 -- Peter Geldof
 3605 -- Steve Saslow (USA)
 3681 -- Pepper S. Younts (USA)
 3685 -- Cris Vande Velde (DE)
 3748 -- Robert Rosenwald 
 3823 -- David Richardson (USA) -- TwinPrimeCurta; the higher of its twin prime 3821
 3919 -- Santiago de Churruca Egoscozabal -- TwinPrimeCurta; the higher of its twin prime	3917
 3920 -- Carlos Alberto Pedrosa (Brazil)
 3928 -- Rosa Schlaepfer Pereira
 3956 -- Michael Schmitt (Germany) 
 4210 -- Mike Krassenburg (Netherlands)
 4312 -- Alfredo Logioia (Argentina)
 4334 -- Peter Hobbs (UK)
 4336 -- Peter Hobbs (UK)
 4352 -- Cornelis van den Berg (The Netherlands)
 4379 -- Frans Goedhart (Fransamsterdam, The Netherlands)
 4399 -- Charles Lawson (UK)
 4404 -- Charles Lawson (UK)
 4414 -- John Race
 4421 -- JackChristensen (USA) -- PrimeNumberCurta
 4440 -- Graham Nash (Australia)
 4457 -- David Hammelef (USA) (USA) -- PrimeNumberCurta 
 4469 -- Donald Rosen (USA)
 4473 -- Donald Rosen (USA)
 4474 -- John Bell
 4529 -- Erez Kaplan
 4632 -- Michael Schmitt (Germany)
 4636 -- Hermann Hierhager (Germany)
 4641 -- Konstant van der Walt (South Africa)
 4703 -- James Black -- PrimeNumberCurta
 4730 -- Mitch Wofchuck
 4744 -- Donald Rosen (USA)
 4811 -- Donald Rosen (USA)
 4937 -- JackChristensen (USA) -- PrimeNumberCurta
 4965 -- Tyler Martin (USA)
 5098 -- Ignacio Barbosa Moreira
 5099 -- Peter Bird -- TwinPrimeCurta; the lower of its twin prime 5101
 5187 -- Mike Griessel
 5212 -- JackChristensen (USA)
 5227 -- Lita Hayes -- PrimeNumberCurta
 5254 -- Mike Bell (South Africa)
 5257 -- Bob Holmstrom (USA) -- original owner Basil Wilson (South Africa)
 5289 -- beck
 5357 -- Wayne Kiely (Australia)
 5358 -- Carlos Alberto Pedrosa (Brazil)
 5476 -- Philippe d'Anfray (France)
 5581 -- Mai Fang Thomson
 5686 -- Julian Alejandro Lell (Argentina)
 5687 -- TomsCollection (Switzerland)
 5856 -- Alastair Redpath-Stevens
 6083 -- Israel da Silva (Brazil)
 6195 -- Harry Walter (Germany)
 6394 -- Matthew Smith (UK)
 6404 -- Peter Hobbs (UK)
 6427 -- Terry Newman (France)
 6472 -- TomsCollection (Switzerland)
 6640 -- Jason Latta (New Zealand)
 6656 -- R. N. Labas (Chile)
 6735 -- Jim Walpole (UK)
 6766 -- Tom Bedard (USA)
 6798 -- RolandL (Switzerland)
 6824 -- Ric Capucho (Switzerland)
 6845 -- Dr David Key
 6949 -- Samuel Sit (Hong Kong) -- TwinPrimeCurta; the higher of its twin prime	6947
 7057 -- Daniel Lewin -- PrimeNumberCurta
 7087 -- Joel Texier
 7091 -- Pete (Germany)
 7165 -- TomsCollection (Switzerland)
 7203 -- TomsCollection (Switzerland)
 7209 -- TomsCollection (Switzerland)
 7212 -- Charles Lawson (UK)
 7217 -- John Pountney (UK)
 7269 -- Ian Battey
 7430 -- Graham Nash (Australia)
 7450 -- Waldbauer Helmut
 7561 -- TomsCollection (Switzerland)
 7633 -- E. Sprague (USA)
 7624 -- Donald Rosen (USA)
 7625 -- Donald Rosen (USA)
 7676 -- Greg Lathan
 7729 -- DOouglas Mahone (USA)
 7753 -- Hermann Hierhager (Germany) -- PrimeNumberCurta
 7790 -- Bob Sliter (USA)
 7852 -- RolandL (Switzerland)
 7854 -- David Southall
 7903 -- Bernard Cadier
 8005 -- Ric Capucho (Switzerland)
 8024 -- Ákos Tajti (Hungary)
 8072 -- Gaston Martin Ferreiros (Argentina)
 8121 -- Sebastian Dammers
 8245 -- H.J.MEAD
 8248 -- Maurice Robinson
 8257 -- Ferry Saur (Australian living in Warsaw, Poland)
 8321 -- Nicholas Cassin
 8354 -- John Birch
 8363 -- Deborah Davies (UK)
 8397 -- RolandL (Switzerland)
 8399 -- John Bentley
 8400 -- Charles Knowles (UK)
 8428 -- David Owensby
 8651 -- Private (UK) -- Demo Curta in green presentation box
 8726 -- Dr. Srinivas K. Reddy
 8863 -- Neal Sloane (USA) TwinPrimeCurta (Higher of Twin)
 8883 -- Ralph Hesson
 8892 -- beck
 8996 -- Carola Gerlach (Germany)
 9068 -- Nita de Glanville
 9092 -- Glen Davidge
 9178 -- Carlos Alberto Pedrosa (Brazil)
 9242 -- Martin Wood 
 9296 -- James Black
 9517 -- Craig McCormack (UK)
 9570 -- Erik Novikoff
 9569 -- Mandi (Germany)
 9585 -- TomsCollection (Switzerland) - round pin sliders, mint
 9724 -- Peter Hobbs (UK)
 9835 -- Curtis Holmes (USA)
 9916 -- Mark G. Leonard
 9929 -- Donald Rosen (USA) TwinPrimeCurta (Lower of Twin)
 10024 -- Vincent Merlen (CAN) 
 10133 -- Mario Nagano -- PrimeNumberCurta
 10148 -- Paulo Boselli
 10203 -- David Hammelef (USA)
 10212 -- Donald Rosen (USA)
 10265 -- Frank De Witt
 10289 -- Clifford A Johnson (USA) PrimeNumberCurta
 10300 -- David Bannister
 10303 -- John Partridge (USA) "PrimeNumberCurta"
 10335 -- Geof Spehar (USA)
 10370 -- David Richardson (USA)
 10414 -- Fernando Aveledo (Venezuela)
 10577 -- Prof. Karl Kleine
 10582 -- George O'Farrell
 10643 -- Donald Rosen (USA)
 10759 -- Colin Labouchere
 10804 -- G. Chang (USA)
 11039 -- Gernot Hilger (Bonn, Deutschland) (S/N=7x19x83)
 11140 -- Sebastian Dammers
 11155 -- Robert Adam
 11213 -- Morten Sandorff (DK) -- PrimeNumberCurta
 11220 -- Lars Lund-Hansen
 11259 -- John Wells (South Africa)
 11326 -- Matthew Julius Taylor alias Techmoan (UK)
 11344 -- Andy Barkley (UK)
 11348 -- Eddie Letzer
 11536 -- Marc Hoffeld
 11554 -- Ruben Barros (Argentina)
 11779 -- Bob Cohen (USA) -- PrimeNumberCurta
 11848 -- Martin Haider (Austria)
 12023 -- Francisco A. Amaral
 12203 -- Pepper S. Younts (USA) -- PrimeNumberCurta
 12270 -- Juan Luis Munoz de Laborde 
 12365 -- Robert Shaffe
 12387 -- Steve Englebrecht (USA)
 12405 -- Ben Wright (USA)
 12561 -- Federico Molina Felix (Madrid, Spain)
 12591 -- Private (USA) -- Demo Curta in green presentation box
 12744 -- Tyler La Dow
 12793 -- Laurence Bixby
 12841 -- John Lafler -- PrimeNumberCurta
 12873 -- David Lukasik
 12877 -- Donald Rosen (USA)
 12936 -- Charles Brown
 12969 -- Dr Patrick Covernton
 13017 -- Rob Lewis
 13056 -- Adam
 13136 -- Birthe Dissing
 13155 -- Werner Berger (Switzerland)
 13247 -- Julian Alejandro Lell (Argentina)
 13316 -- Leo F Braun
 13426 -- Dan Kennison
 13545 -- Matthias M Weber
 14082 -- Tatsushi Utsumi (Japan)
 14310 -- Vincent Lextrait (France)
 14320 -- German Castro (Spain)
 14392 -- Brian Lewis
 14568 -- Habib Karacan
 14611 -- Ed Zinszer
 14902 -- James Black
 14949 -- Dan Hamilton
 14951 -- Wesley Riddle (USA)
 14961 -- Denise Bank
 15012 -- Don Speray (USA)
 15045 -- Rick Furr (USA)
 15053 -- Paul Ricci -- PrimeNumberCurta
 15147 -- Richard D. Cohen, Jr.
 15156 -- Steve Englebrecht (USA)
 15255 -- Richard Wilkins (UK)
 15529 -- Pepper S. Younts (USA)
 15604 -- David Irwin (United Kingdom)
 15768 -- K. Kettunen (Helsinki, Finland)
 15881 -- Rich Beck -- PrimeNumberCurta
 15931 -- Juan L�pez Torrent Curta Type I (Spain)
 15941 -- David Harper (USA)
 16376 -- beck
 16626 -- Andrea Rimondi (Italy)
 16812 -- Richard Rafter
 16829 -- Dave Slater -- PrimeNumberCurta
 16855 -- Jeff Wilson
 16925 -- David Ferster (USA)
 16956 -- Dr. Stan Fry, Jr. 
 16985 -- David Owensby
 16992 -- JackChristensen (USA)
 17075 -- JackChristensen (USA)
 17083 -- Anibal Rivera (Colombia)
 17626 -- Stanley Siege
 17881 -- Daniel Davis (USA) -- PrimeNumberCurta
 17903 -- Jim Bridges -- PrimeNumberCurta
 17939 -- Neal Sloane (USA) -- PrimeNumberCurta
 17942 -- Peter Schneider (USA)
 18027 -- Bob Grow
 18083 -- Karin Kessler (CT, USA)
 18100 -- Albert Wong (USA)
 18166 -- Larry Byler (USA)
 18204 -- Robert Delgado (USA)
 18223 -- Don Holmgren (USA) -- PrimeNumberCurta
 18242 -- Don Speray (USA)
 18442 -- Terence J Westoby (France)
 18742 -- Tom Hobbs (UK)
 18754 -- Gerry Kennedy (UK)
 18832 -- Linda Blythe
 18860 -- Mark Butt (UK)
 18866 -- James Black
 18883 -- Vincent Lextrait (France)
 18944 -- Lars Lund-Hansen
 19031 —  Mark Pavia (USA)
 19038 -- Orthopedic Surgeon 
 19049 -- Dov Gadot
 19327 -- Craig Reynolds
 19500 -- Norm Guttormson
 19622 -- Patrick Laird
 19716 -- Peter Misic
 19732 -- John Pountney (UK)
 19739 -- Peter Hobbs (UK) -- PrimeNumberCurta
 19834 -- Joel O'Rourke
 19847 -- Ian Gent
 19881 -- Daniel V Klein
 20021 -- Darrel R. Dilley -- TwinPrimeCurta; the lower of its twin prime 20023
 20022 -- Bobby L. Jones
 20071 -- Bill Taylor A.S.C. -- PrimeNumberCurta
 20089 -- Gary Marsden -- PrimeNumberCurta
 20112 -- Gary Nivaggi (USA) 
 20247 -- Jay Holovacs
 20255 -- Takashi Tanemura (Japan)
 20342 -- Richard Templeton (Australia)
 20350 -- Valery Tsimmerman, P.E. 
 20526 -- Harold Mernick
 20543 -- Giovanni De Pasquale (Switzerland) -- PrimeNumberCurta
 20759 -- Kurt Rochlitz -- PrimeNumberCurta
 20923 -- Alfredo Logioia (Argentina)
 20975 -- Steve Englebrecht (USA)
 21302 -- Don Spann (USA)
 21319 -- Jim May -- PrimeNumberCurta
 21352 -- Dean P Mc Cullough
 21360 -- Dean Rudenauer (USA)
 21403 -- Ken Campbell (CAN)
 21452 -- Craig Hammes
 21994 -- Mike Williams
 22012 -- Chris Williams (Wales)
 22102 -- Luc Degols
 22583 -- Evan Dolezal (USA)
 22687 -- Jerry L. Sokol (USA)
 22716 -- Tobi Brenner (Germany)
 22743 -- beck
 22908 -- Herb Gold
 22992 -- Dietrich M�nchmeyer (Germany)
 23575 -- Mark Westaway
 23602 -- Christophe Guerin (France)
 24019 -- Carlos L. Gaston -- PrimeNumberCurta
 24149 -- Peter W. Allen
 24218 -- Don Hediger
 24240 -- Eric Desjardins (France)
 24446 -- Marc Hoffman (Canada) -- purchased on eBay/Argentina/adalberto/Gabriel - and never received !!!
 24507 -- Martin Strange (Canada)
 24535 -- A. J. M.�van der Vaart  (The Netherlands)
 24558 -- Private -- Demo Curta in green presentation box
 24645 -- TomsCollection (Switzerland)
 24838 -- Andres Romero Ortiz 
 24855 -- Martin Feichtinger
 24907 -- Stephen Pickles (UK) -- PrimeNumberCurta
 25103 -- Rouland Gaudet (Canada)
 25194 -- Janelle Stancik (USA)
 25356 -- Bruno Perrone Delgado (Ecuador)
 25575 -- Stephan Fricke (Germany)
 25668 -- Edmundo Duran
 25801 -- Donald Rosen (USA) TwinPrimeCurta; the higher of its twin prime 25799
 25832 -- Otto Frex Mayer
 25915 -- Art Rosen
 25945 -- Donald Rosen (USA) -- Demo Curta in green presentation box
 26021 -- Josu Aramberri (Spain) -- PrimeNumberCurta
 26051 -- Carlos Navalón (Barcelona - Spain)
 26057 -- Roman Adillon (Barcelona - Catalonia)
 26229 -- Riccardo Moschetti (Italy)
 26380 -- Marijn van Wezel (The Netherlands)
 26449 -- Gilles Bajolet -- PrimeNumberCurta
 26458 -- Gary Williams (UK)
 26501 -- Donald Rosen (USA) Cut Model Prime Number Curta
 26646 -- beck
 27545 -- Dave Aitchison (Australia)
 27560 -- beck
 27970 -- Sandra Ausher
 27978 -- Carlos Alberto Pedrosa (Brazil) 
 27988 -- Alfred Peischl (Austria)
 28037 -- Whisperine
 28269 -- John Bellefleur (Canada)
 28290 -- Dave Estall
 28332 -- Gus Teljer
 28382 -- Caesar Guevara 
 28395 -- Karin Kessler (CT, USA)
 28732 -- Jacob M. (USA)
 29040 -- Daniel J Zoschke  (Timmins,Ontario,Canada)
 29063 -- Paul Powell -- PrimeNumberCurta
 29093 -- Patrick Finnigan
 29274 -- John Steigerwald
 29505 -- Rob Waight
 29636 -- Michael C. Gibbons
 29749 -- Peter H. Fisher (UK)
 29759 -- Martin Sidley -- PrimeNumberCurta
 29799 -- Corey R. Vest
 29810 -- Waldbauer Helmut
 30032 -- Marco Pederzoli (Italy)
 30048 -- Alan Carter (UK)
 30422 -- Louis Skelton, Curator
 30786 -- beck
 30903 -- Gerry Hughes
 31000 -- Peter Marshall (UK)
 31110 -- Cris Vande Velde (DE)
 31486 -- Juerg Dedual
 31649 -- Peter Hobbs (UK) -- PrimeNumberCurta
 31654 -- Klara Reisch
 31732 -- Granville Knox (USA)
 31797 -- Mery Christophe
 31876 -- Roy Hurford (UK)
 32280 -- Keith Hall (UK)
 32525 -- Luis Navarro (Colombia) 
 32597 -- Bill Taylor A.S.C.
 32816 -- Julian Alejandro Lell (Argentina)
 32882 -- William R. Clements
 32937 -- Denis Miller (Australia)
 33138 -- John Bellefleur (Canada)
 33139 -- Wesley Riddle (USA)
 33140 -- John Bellefleur (Canada)
 33142 -- Alex (Sandy) Mackay
 33199 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 33212 -- Nicholas Bodley
 33940 -- Marcelo Amarante
 34091 -- Keene Kelley (New Orleans, LA, USA)
 34097 -- Stefan Nordqvist
 34224 -- Ben Edgington
 34387 -- Hans-Joachim Hoeft
 34390 -- Ken Small (USA)
 34398 -- Vincent Andrunas (USA)
 34400 -- Sandy Houck
 34447 -- Charles Lawson (UK)
 34624 -- Alex Zhou (Hong Kong)
 34656 -- Private (USA) -- Demo Curta in green presentation box
 34712 -- Bill Bowers
 34726 -- Cleo E. Mc Call
 34771 -- John Isham (USA)
 34811 -- Steve A
 34969 -- Darrin B (USA)
 35058 -- Phil Symons 
 35136 -- Maciej M. Syso (Poland)
 35177 -- TomsCollection (Switzerland) - Demo Curta in green presentation box
 35243 -- David Senkfor (USA)
 35276 -- John De Koning
 35402 -- Paul Whittaker (Ontario, Canada)
 35410 -- Fredrik Breivald
 35672 -- Gary Williams (UK)
 35729 -- Andrew S. Walker (UK)
 35923 -- Olle Nilsson -- PrimeNumberCurta
 35969 -- Peter Hobbs (UK) -- PrimeNumberCurta
 36252 -- Frank G. Soler
 36440 -- Erwin Tomash
 36495 -- Peter G. Smith (Vanderkloof, South Africa)
 36642 -- Hans-Joachim Hoeft
 36869 -- beck
 37262 -- Christian Miller (Austria) -- Demo Curta in green presentation box
 37279 -- Harold Meltzer
 37280 -- Karin Kessler (CT, USA)
 37338 -- Pete (Germany)
 37339 -- Pete (Germany)
 37443 -- Tolly Hill (UK)
 37583 -- John Bellefleur (Canada)
 37683 -- Pierre Zimmerman
 37901 -- Stephan Fricke (Germany)
 37947 -- Ulrich Clormann
 38216 -- TomsCollection (Switzerland)
 38203 -- Harold Meltzer
 38230 -- Mohammed Zahir .M. Chawdhry
 38282 -- Roger R. Hineman
 38308 -- beck
 38335 -- Simon Cassford
 38368 -- Erez Kaplan
 38599 -- Mark Butterworth
 38603 -- John S. James -- PrimeNumberCurta
 38696 -- Robert G. Baumann (USA)
 38766 -- Martin Feichtinger
 38872 -- Graham Nash (Australia)
 39078 -- Julian Alejandro Lell (Argentina)
 39133 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 39172 -- Skip Downey (USA)
 39290 -- Alexandru Floca (Romania)
 39328 -- Don Spencer (USA)
 39353 -- Chris Warman (USA)
 39621 -- Randall Gray (USA)
 39643 -- Craig Seeley
 39810 -- Skip Hudspeth (USA)
 39811 -- Steve Englebrecht (USA)
 39824 -- Peter Hobbs (UK)
 40030 -- Michael Meissner (Germany)
 40198 -- Jan Brown
 40212 -- TomsCollection (Switzerland)
 40437 -- Ray Feldman
 40557 -- Ray Woods
 40578 -- TomsCollection (Switzerland)
 40674 -- Bruno Wroblewski
 41046 -- Murray Felstead
 41115 -- Miki Mihajlovic
 41149 -- Trent Huber (USA)
 41273 -- Scott Allendorf (USA)
 41784 -- Bruce C. Boatwright (Madison, SD)
 41837 -- Peter Hobbs (UK)
 41989 -- Dr. Srinivas K. Reddy
 42098 -- TomsCollection (Switzerland)
 42177 -- Paul Van Hoof
 42464 -- John William Backs
 42769 -- Heidi Abrams
 42770 -- Arthur S. Graham (USA)
 42811 -- Troy Eagan (USA)
 42999 -- Dana G. Tremblay
 43080 -- Steve White
 43210 -- Hermann Hierhager (Germany)
 43241 -- Gary Steinbaugh
 43298 -- Ann R. Craven
 43323 -- Larry D. Allgood
 43372 -- Julian Alejandro Lell (Argentina)
 43403 -- Jorge Tadeo Rojo (Argentina)
 43437 -- Donald A. Sharp 
 43547 -- Lavillat Christian
 43637 -- Ronald Grays (USA)
 44150 -- Rick Stanard
 44193 -- David Bonnes
 44224 -- RolandL (Switzerland)
 44233 -- Christoffer Holmberg
 44290 -- Beatriz Tokuzumi  (Brazil)
 44385 -- Don Murtagh
 44423 -- Max Matthews
 44583 -- Kurt Akeley (USA)
 44604 -- TomsCollection (Switzerland)
 44605 -- Thomas Shaffer
 44642 -- George Bingley
 45160 -- R. N. Labas (Chile)
 45167 -- Richard Weixler
 45327 -- Alfredo Logioia (Argentina)
 45632 -- Neil Bartlett
 45740 -- Pepper S. Younts
 45945--  Ben Wright (USA)
 46011 -- Peter Hobbs (UK)
 46344 -- F. Trost (Australia)
 46441 -- Anibal Rivera (Colombia)
 46560 -- Kleber Loureiro (Brazil)
 47361 -- Thomas Minnick (USA)
 48243 -- John J Pisarcik
 48648 -- Derick Fahnestock (USA)
 48663 -- Brian Randell (UK)
 48680 -- Pablo Flores Maini
 48722 -- Waldbauer Helmut
 48723 -- Fredrick Karubian
 48762 -- Waldbauer Helmut
 48808 -- Artur Kultys (Poland)
 48838 -- Mal Thurman
 48842 -- Don Townsend
 49233 -- Julian Alejandro Lell (Argentina)
 49400 -- Tunny Pattison
 49414 -- Dale Boyd
 49444 -- Brian Lewis
 49465 -- Larry Mc Elhiney
 49603 -- Darin May -- PrimeNumberCurta
 49687 -- David Elworthy (USA/UK)
 49930 -- TomsCollection (Switzerland)
 49935 -- Martin Gwerder (Switzerland)
 50084 -- Paul Bywater (UK) 
 50248 -- Oktay Haracci 
 50315 -- Franco Cattafesta (Italy)
 50383 -- Mark W. Rodgers -- PrimeNumberCurta
 50448 -- Harold Goldberg 
 50452 -- Maxwell Goskie
 50492 -- Mario Garza
 50515 -- William Wasmer
 50571 -- Doug Glover
 51196 -- Bengt-Eric Grandin
 51266 -- Ken Sanford (USA)
 51295 -- Frank Gagliano
 51754 -- JackChristensen
 51832 -- Peter Hobbs (UK)
 51842 -- David Andersen
 51909 -- Douglas A. Cawley
 52040 -- Charles Lawson (UK)
 52043 -- Jim Bianchi
 52116 -- Charles Jensen
 52212 -- E Mc Erlean (UK)
 52241 -- Graham Nash (Australia)
 52292 -- Matthew Moss (USA)
 52313 -- Peter Schneider (USA)
 52322 -- David Edgington (UK)
 52454 -- Victoria Landgraf (New Zealand)
 52458 -- Lawrence Keeney
 52546 -- Elizabeth Greenberg
 52551 -- Ben Wright (USA)
 52641 -- Kerry Kyriacou (Australia)
 53124 -- Klaus Hanfler
 53177 -- Waldbauer Helmut
 53233 -- Steve Englebrecht (USA)
 53256 -- The Boyds
 53267 -- Jamie Cox -- TwinPrimeCurta; the lower of its twin prime
 53323 -- Richard Weixler -- PrimeNumberCurta
 53429 -- Ulrich Clormann
 53611 -- Donald Rosen (USA) -- TwinPrimeCurta; the higher of its twin prime 53609
 54378 -- Ben Wright (USA)
 54647 -- Doug Woods -- PrimeNumberCurta
 55244 -- Guillermo Fernandez Boan (Argentina) 
 55358 -- Peter Hobbs (UK)
 55500 -- Pepper S. Younts (USA)
 55628 -- Jim Spofford
 55800 -- Marcel van der Sluis
 55845 -- Glenn Bell
 55875 -- Fung Mun Tong Louis (Hong Kong)
 55900 -- Evan M. Shaffer (USA)
 55937 -- Donald Rosen (USA) -- Cut Model
 56190 -- MD Meason 
 56245 -- Joseph J Hansen
 56250 -- RT Young
 56295 -- Michele Sandra Murphy
 56434 -- Matz Cohen
 56691 -- Nathan Zeldes
 56711 -- Donald Rosen (USA) -- TwinPrimeCurta; the lower of its twin prime 56713
 57058 -- Pete (Germany)
 57202 -- JackChristensen (USA)
 57376 -- Waldbauer Helmut
 57555 -- Steve Saslow (USA)
 57592 -- Peter Hobbs (UK)
 57607 -- Brian Cohen
 57756 -- Donald Rosen (USA)
 57897 -- Andy McNish? (Canada)
 58029 -- Mark Butt (UK)
 58134 -- Ken Seydel
 58294 -- Grant Youngman
 58298 -- John Bellefleur (Canada)
 58514 -- Aleksi Salomaa (Finland)
 58562 -- Rick Furr (USA)
 58582 -- David Richardson (USA)
 58736 -- Matthew Smith (UK)
 58829 -- Private (UK)
 59014 -- Stephen Brindle (UK)
 59073 -- Giovanni Breda
 59112 -- Udo Stichling
 59115 -- Adam Bunn (UK)
 59132 -- Aimeric 
 59263 -- Dr G B Davidson (California USA) -- "PrimeNumberCurta"
 59349 -- Glenn Jolliffe
 59442 -- Antonio Tuzzi (Italy)
 59504 -- Alfredo Logioia (Argentina)
 60003 -- Mark Warren
 60052 -- Wim Schouten
 60148 -- Lucas Mirelmann (Switzerland)
 60413 -- Pepper S. Younts (USA) -- PrimeNumberCurta
 60510 -- Walter J. Gray
 60609 -- David Senkfor (USA)
 60674 -- Roger D. Brown
 60870 -- Mark Handler
 60970 -- James Osborne (UK)
 61438 -- Graham D Harris
 61821 -- beck
 61990 -- Giovanni Breda
 62076 -- R. Bruce Gezon
 62276 -- Juan Antonio Lotero (Colombia) 
 62305 -- Donald Rosen (USA)
 62548 -- Susan B. Gallagher (USA)
 62569 -- Bob Mason
 62675 -- Gray Poole
 62736 -- Adam Savage (USA)
 63239 -- Karin Andersson (Sweden)
 63252 -- Fred Jacobs
 63341 -- Peter Hobbs (UK)
 63556 -- s112358
 63708 -- Julian Burke
 63968 -- Harrison Spain (USA)
 64051 -- Neal Sloane (USA)
 64065 -- K. J. Curtis
 64112 -- Chris Woodward
 64112 -- Mike Munn (UK) June 2005 ..
 64205 -- Martin Loveridge (Canada)
 64224 -- Lindley and Charlotte Mixon
 64360 -- Charles Smith
 64379 -- Netjeff (USA)
 64448 -- Tony Bennett (UK)
 64555 -- E. H. Rettig
 64779 -- Werner Schaefer
 65195 -- Zachary Jones (USA)
 65250 -- Stephen Rowe
 65303 -- Alan McGarvey? (UK)
 65448 -- B.R.Nivreg (Germany)
 65622 -- Steve W. Nichols (USA)
 65787 -- J. N. Luttjehuizen (Bellingwolde, the Netherlands)
 65929 -- Thomas Mc Namara (USA) -- TwinPrimeCurta; the higher of its twin prime 65927 
 65963 -- Michael Jason Edwards -- PrimeNumberCurta
 66132 -- Bill Leonard
 66313 -- Johan Mangs (Finland)
 66561 -- Sebastian Dammers
 66666 -- Michael Barger
 66683 -- Laszlo Boydan
 66759 -- Martin Strange (Canada)
 66831 -- Thom Boughton
 66870 -- Dave Bunsey, Sr.
 66878 -- Karin Kessler (CT, USA) 
 67290 -- Richie Tomasich
 67399 -- George E. Heath -- PrimeNumberCurta
 67509 -- Dave Richardson (UK)
 67544 -- Jim Carlson
 67557 -- Alex Friedman
 67619 -- Rich Scholl -- PrimeNumberCurta
 67721 -- William A. McGrath? (USA)
 67741 -- Mark Jason Dominus -- PrimeNumberCurta
 67799 -- Kenneth Spink
 67804 -- Chris Spurgeon (USA)
 67995 -- Dib Karam Junior
 67997 -- Ludgerus Friedhoff
 68005 -- Karin Kessler (CT, USA)
 68187 -- Alois Gst�ttner (Vienna, Austria)
 68429 -- Kevin R Boyne (USA)
 68531 -- Julian Alejandro Lell (Argentina) -- PrimeNumberCurta
 68696 -- Javier Susaeta-Erburu
 68795 -- Matthew Smith (UK)
 68909 -- David Weil -- PrimeNumberCurta
 69099 -- Carlos H. Garcia Palermo
 69125 -- David Bannister
 69601 -- Eric Furman
 69639 -- Ben Hogue
 69716 -- Herman Krieger (USA)
 69979 -- Larry Vanice
 70071 -- Douglas Brown
 70141 -- Rouland Gaudet (Canada) -- TwinPrimeCurta; the higher of its twin prime 70139
 70224 -- Peter Guerrini
 70393 -- Donald Rosen (USA)
 70511 -- James Godwin
 70669 -- Bill Leonard
 70740 -- TomsCollection (Switzerland)
 70883 -- Andrew Davie
 71050 -- David Hahn (USA)
 71070 -- Rupert Quayle
 71125 -- David Kristopeit
 71132 -- Donald Rosen (USA)
 71198 -- Hap Murphy
 71239 -- JackChristensen (USA)
 71274 -- Etienne Pommel (France)
 71275 -- William Mc Bride
 71375 -- Rodger Morton (Australia)
 71424 -- Bill Stanard
 71335 -- Stephen M. Evans
 71711 -- Donald Rosen (USA)
 71739 -- Tom Callan
 71742 -- Telephoto Media (Germany)
 71866 -- Eyal Eckstein
 72150 -- Dave Hammelef (USA)
 72252 -- Charles Lawson (UK)
 72353 -- Chris Andreae -- PrimeNumberCurta
 72367 -- JackChristensen (USA)
 72412 -- Darrell Haulsee
 72523 -- Robert Irwin
 72538 -- Nigel Thompson
 72637 -- JackChristensen (USA)
 72700 -- JackChristensen (USA)
 72857 -- Clay Castleberry
 73060 -- Bill Thacker
 73064 -- Ian Drown
 73410 -- Andrew Forsberg
 73545 -- Allan Simon
 73591 -- Herb Gold
 73736 -- Rick Miskell 
 73961 -- Scott Soper -- PrimeNumberCurta
 74021 -- Walt Kammer (USA) -- PrimeNumberCurta
 74116 -- Jim Hawkins
 74416 -- beck 
 74557 -- Alan Taplow (VT-USA)
 74678 -- Mark Reinhardt
 75068 -- Leo Ronald Morris
 75083 -- Gerhard Wenzel -- PrimeNumberCurta
 75262 -- Dave Daley 
 75395 -- Adams Douglas
 75422 -- Peter Hobbs (UK)
 75460 -- Donald Rosen (USA) 
 75549 -- Tom Poole 
 75586 -- Arden Howell IV
 75587 -- Anmol Brian Pinto (India) 
 75789 -- Diane 
 75896 -- Roland Soucie 
 75931 -- Richard L. De Saussure, III -- PrimeNumberCurta
 76060 -- Pete Prior (UK)
 76153 -- Michel Poirier-Defoy
 76302 -- Karin Kessler (CT, USA) 
 76258 -- Vaclav Michal Stepanek 
 76640 -- Gary D. Snyder
 76688 -- Michael Stevens
 76695 -- James Bradshaw (UK)
 76966 -- Skip Hudspeth (USA) 
 76994 -- Gary Fleischer 
 77052 -- Harold Mernick
 77061 -- COL Jim Van Dam (Ret)
 77129 -- Donald Rosen (USA)
 77140 -- TomsCollection (Switzerland)
 77142 -- Skip Godfrey (USA)
 77248 -- Charles Knowles (UK)
 77514 -- Joel O'Rourke
 77590 -- John Pountney (UK) 
 77619 -- MSG Larry Turley 
 77621 -- David Senkfor (USA) -- PrimeNumberCurta
 77648 -- David Rackowitz	
 77678 -- Terry Petty
 77723 -- Jason Affourtit (USA) -- PrimeNumberCurta
 77735 -- Christopher Paraskevas
 77798 -- Burt Newmark 
 77823 -- Graham Hill
 77890 -- Donald Rosen (USA) 
 77908 -- Bill Potvin
 77925 -- Alejandro Fernandez Jr. (USA)
 77937 -- Donald Rosen (USA)
 78028 -- Gifted by James Dowling to William Gibson, author of "Pattern Recognition"
 78057 -- John Favill 
 78096 -- Tommy Estridge
 78106 -- Graham Nash (Australia)
 78170 -- Adam Gohil (UK)
 78223 -- Alfredo Logioia (Argentina)
 78363 -- Jim Walpole (UK)
 78642 -- Dianne Wood 
 78733 -- Harry Reed (UK) 
 78845 -- J. Dekker
 78791 -- Donald Rosen (USA)-- PrimeNumberCurta
 79020 -- John Marvin 
 79123 -- Bernhard Adams 
 79130 -- JackChristensen (USA)
 79256 -- Mac Thompson
 79294 -- Pepper S. Younts (USA)
 79527 -- Roy Milan (USA)
 79532 -- Randall N. Robinson (USA) 
 79572 -- Martin Feichtinger
 79618 -- Kevin Hahn (Germany)
 79721 -- Peter Hobbs (UK)
 79813 -- Hoch Florian -- PrimeNumberCurta
 79933 -- Donald Rosen (USA)
 79960 -- John Pountney (UK)
 80172 -- Mandi (Germany)
 80266 -- Donald Rosen (USA)
 80288 -- Thomas Stocker
 80320 -- Donald Rosen (USA)
 80332 -- Hermann Hierhager (Germany) 
 80352 -- Arndt Fiedler (Germany)
 80358 -- TomsCollection (Switzerland)
 80380 -- TomsCollection (Switzerland)
 80421 -- beck
 88517 -- Julian Alejandro Lell (Argentina)

TYPE IA

 100014 -- Christian Fischer (Liechtenstein) - A rare prototype for the never released Type IA 
 100022 -- beck
 100039 -- beck
 100044 -- Mandi (Germany) 
 100086 -- Hermann Hierhager (Germany)

 P-004 -- CurtaLi (Switzerland)
 P-005 -- Arithmeum - University of Bonn (Germany)

TYPE II

 500008 -- Carlos Alberto Pedrosa (Brazil)
 500024 -- Mandi (Germany)
 500025 -- Jim Walpole (UK)
 500028 -- Mandi (Germany)
 500066 -- CurtaLi (Switzerland)
 500067 -- Brian J. Ke
 500073 -- TomsCollection (Switzerland)
 500084 -- Fred Sweeting 
 500125 -- Hermann Hierhager (Germany)
 500136 -- Donald Rosen (USA)
 500159 -- Ian Mcintyre (New Zealand)
 500161 -- CurtaLi (Switzerland)
 500189 -- Donald Rosen (USA)
 500204 -- Donald Rosen (USA)
 500223 -- Pete (Germany)
 500225 -- Donald Rosen (USA)
 500236 -- Craig McCormack (UK)
 500261 -- Donald Rosen (USA)
 500315 -- Steve Saslow (USA)
 500355 -- Mark Whiteley (UK)
 500409 -- TomsCollection (Switzerland)
 500415 -- JackChristensen (USA)
 500421 -- Steve Englebrecht (USA)
 500439 -- beck
 500446 -- David Briggs (UK) Note: the internal s/n shows 500447.
 500485 -- Tony Offerman
 500494 -- JackChristensen (USA)
 500547 -- TomsCollection (Switzerland)
 500608 -- Alfredo Logioia (Argentina)
 500639 -- Paul Smith
 500640 -- Pepper Younts (USA) 
 500671 -- David Richardson (USA)
 500740 -- Christophe Guerin (France)
 500814 -- Donald Rosen (USA)
 500845 -- Martin Feichtinger 
 500934 -- Charles Lawson (UK)
 500963 -- Donald Rosen (USA)
 500987 -- TomsCollection (Switzerland)
 501063 -- Donald Rosen (USA)
 501065 -- Donald Rosen (USA)
 501067 -- Steven Swift (USA)
 501072 -- Donald Rosen (USA)
 501174 -- Ian Brooks (UK)
 501203 -- Donald Rosen (USA)
 501324 -- Bernard Stedman 
 501325 -- Damon O'Donoghue 
 501374 -- JackChristensen (USA)
 501449 -- DennyHardy (Europe)
 501523 -- Roger Kirkham 
 501656 -- Dwayne Newton 
 501787 -- Victor Kuhl
 501868 -- Ruben Barros (Argentina)
 501878 -- Donald Rosen (USA)
 501905 -- Mike Williams 
 501934 -- Alfredo Logioia (Argentina)
 502072 -- Donald Rosen (USA)
 502166 -- beck
 502170 -- Don Speray (USA)
 502211 -- Peter Hobbs (UK)
 502527 -- Nick Taylor (UK)
 502620 -- Richard Freedland 
 502693 -- Harold Mernick
 502809 -- David Nessl
 502824 -- Ken Meddock (USA)
 502847 -- Donald Rosen (USA)
 502909 -- Keith Hall (UK)
 503012 -- Renan Greca (Brazil)
 503125 -- Vaggelis Doxakis (Greece)
 503167 -- Nicolas Schmitt (Germany)
 503302 -- Graham Nash (Australia) 
 503322 -- Waldbauer Helmut 
 503359 -- Glen Davidge -- PrimeNumberCurta
 503399 -- Shawn Sullivan (USA)
 503404 -- Charles Lawson (UK)
 503486 -- John Rix
 503487 -- Vincent Merlen (CAN)
 503491 -- Pepper S. Younts (USA)
 503498 -- Maria Eugenia Martinez Troya (Argentina)
 503541 -- RolandL (Switzerland)
 503818 -- Don Speray (USA)
 503867 -- Alan Hoare 
 503961 -- Peter Hobbs (UK)
 504044 -- Stephan Fricke (Germany)
 504100 -- beck
 504220 -- Hans-Joachim Hoeft 
 504270 -- Ric Capucho (Switzerland)
 504538 -- Donald Rosen (USA)
 504632 -- Don Speray (USA)
 504661 -- Norman Hart (UK)
 504708 -- David Richardson (USA)
 504848 -- beck
 504889 -- Donald Rosen (USA)
 504903 -- Abie Hancox (UK) 
 504913 -- Martin Strange (CAN)
 504988 -- John Favill
 505027 -- Institution of Engineering Designers (UK) -- PrimeNumberCurta
 505064 -- Stephen Batchelor (UK)
 505078 -- John.E.Smith (UK)
 505125 -- Peter and Margaret Bradley UK)
 505168 -- John W. Stanley
 505245 -- R. N. Labas - (Chile) 
 505288 -- Felix Franco
 505299 -- Peter Hobbs (UK)
 505333 -- Skip Hudspeth (USA)
 505429 -- Carlos Alberto Pedrosa (Brazil)
 505454 -- Claudio Ballard
 505518 -- TomsCollection (Switzerland)
 505608 -- Prof. Karl Kleine
 505871 -- Eyal Eckstein
 505917 -- R. N. Labas - (Chile)
 506016 -- Don Speray (USA)
 506051 -- Peter Hobbs (UK) 
 506367 -- Stephen Brenner 
 506370 -- James Freund (USA)
 506419 -- Chris Gillings 
 506524 -- Pablo Andres Pichardo 
 506551 -- RolandL (Switzerland) -- PrimeNumberCurta
 506602 -- German Castro (Spain)
 506711 -- David Spandl 
 506738 -- Doug Fults
 506777 -- Alan O. Cole (UK)
 506838 -- Thomas Mc Namara (USA)
 506844 -- Charles Lawson (UK)
 506849 -- Peter Hobbs (UK)
 506875 -- R. N. Labas - (Chile)
 506936 -- David J. Friedlander
 506938 -- Matthew Smith (UK)
 506949 -- Roger C. Hiorns (France)
 507001 -- Matt Ackermann 
 507157 -- Sebastian Dammers "Silent" Curta
 507175 -- Robert Adam 
 507206 -- Harold Urmston
 507214 -- Robert Leiding
 507315 -- Etienne Pommel (France)
 507358 -- Jim La Rue (USA)
 507435 -- J. Mc Dade 
 507435 -- Richard D. Boltuck 
 507475 -- Skip Hudspeth (USA)
 507631 -- Raimundo Sacrist�n (Spain)
 507640 -- Craig Seeley
 507656 -- Robert Tiffany
 507731 -- Hermann Hierhager (Germany)
 507968 -- Les & Lisa Van Horn
 507976 -- Greg Lathan
 508286 -- William J. Godecker
 508288 -- Ben Wright (USA) 
 508311 -- Malcolm Brooks 
 508456 -- Charles Knowles (UK)
 508642 -- Rick Stanard
 508648 -- Ben Horne (USA)
 508656 -- Cris Vande Velde (DE)
 508727 -- Tony Arnold
 508817 -- Tony Grange (UK) -- PrimeNumberCurta
 508835 -- Michael Terry
 508839 -- Jimmy Walker
 508851 -- Ken Sanford (USA)
 508890 -- Hal Antonson
 508943 -- TomsCollection (Switzerland)
 508949 -- Dave Donovan
 508954 -- James Black 
 508978 -- Art Rosen 
 508991 -- David Bonnes 
 509051 -- Don Speray (USA)
 509135 -- Sebastian Dammers
 509204 -- JackChristensen
 509255 -- Roberto Pinheiro Domingos (Brazil)
 509257 -- Daniel Lewin 
 509304 -- Steve Willey 
 509318 -- Rodd Jones
 509331 -- Dr. Helmut Ziegler (Germany)
 509452 -- Ron Jones
 509713 -- Melquisedec Alvarado (Mexico)
 509760 -- Joel O'Rourke 
 509770 -- Steve Hossner (USA)
 509808 -- Burt I. Weiner
 509872 -- Alfredo Logioia (Argentina)
 509891 -- Stanley Siegel
 509999 -- Andrzej Zbojnowicz
 510000 -- CurtaLi (Switzerland)
 510032 -- Joseph Babcock (USA)
 510241 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 510244 -- Rory Pottage (South Africa)
 510265 -- Arnold de Jong (The Netherlands)
 510292 -- John Bellefleur (Canada)
 510305 -- Donald Rosen (USA)
 510365 -- Jon Svet (USA)
 510392 -- Takashi Tanemura (Japan)
 510395 -- Kate Ednie (GB)
 510422 -- Donald Rosen (USA)
 510423 -- Telephoto Media (Germany)
 510510 -- Donald Rosen (USA) -- "Highest Known Black Body"
 510525 -- Pete (Germany) -- "Lowest Known Olive-Green/Gray Body"
 510533 -- Mandi (Germany)
 510562 -- Donald Rosen )USA) 
 510573 -- Donald Rosen (USA)
 510633 -- Donald Rosen (USA) 
 510675 -- Jorge L. Pang A.  
 510993 -- Ole Steen 
 510997 -- TomsCollection (Switzerland)
 511059 -- German Castro (Spain)
 511181 -- Rick Blake 
 511185 -- Paul Amos 
 511212 -- A Sargeant 
 511219 -- Chris Grow
 511486 -- Victor Kuhl 
 511540 -- David Prendergast (USA)
 511622 -- Fabio Caruso
 511682 -- Enrico Panfili 
 511697 -- Tim Winker (USA)
 511808 -- Steve Englebrecht (USA)
 511861 -- Graham Nash (Australia)
 511869 -- Pete Hewetson
 511884 -- Thomas Mc Namara (USA)
 512045 -- Steve Willey 
 512156 -- Josh Tutt (USA)
 512225 -- Kathryn Hansen (USA)
 512263 -- Chris Lott
 512265 -- DennyHardy (Europe)
 512304 -- Paulo Boselli
 512331 -- Alex Zhou (Hong Kong)
 512367 -- Don Speray (USA)
 512346 -- John Pountney (UK)
 512373 -- Tony Bennett (UK)
 512407 -- Michael Meissner (Germany) 
 512435 -- Jorge Garcia Sanchez (Spain)
 512529 -- Peter Schneider (USA)
 512687 -- Gary W. Gerfen
 512695 -- Richard Shilling (USA)
 512709 -- Peter Hobbs (UK)
 512767 -- Michael Doiron
 512780 -- RolandL (Switzerland)
 512915 -- John Manolis (USA)
 513025 -- John Nice
 513044 -- Barry Moore (Australia)
 513109 -- Richard Moor (USA) -- PrimeNumberCurta
 513115 -- Greg Finn 
 513238 -- Tom Bedard (USA)
 513241 -- Peter Hobbs (*UK)
 513279 -- Tullio Parravicini 
 513379 -- TomsCollection (Switzerland)
 513431 -- Granville Knox (USA) -- PrimeNumberCurta
 513555 -- Bryan C Cloud 
 513709 -- Richard Freedland 
 513710 -- Paul Delmote 
 513923 -- Jay Bayanker
 514112 -- R. N. Labas - (Chile) 
 514128 -- Carlos Alberto Pedrosa (Brazil)
 514228 -- MSG Larry Turley
 514266 -- Peter Hobbs (UK)
 514343 -- Graham Lewis (AU)
 514406 -- Jorge Garcia Sanchez (Gold demo) (Spain)
 514491 -- Rob Reeves (USA)
 514508 -- Richard Barnhart 
 514533 -- Waldbauer Helmut
 514537 -- Jesse Ciecko (USA)
 514658 -- Pepper S. Younts (USA) 
 514680 -- Brent Ayscough
 514686 -- JackChristensen (USA)
 514698 -- Jim Strait (USA)
 514709 -- John H. Eells 
 514725 -- Jim Bell 
 514736 -- Clifford Bruhn 
 514794 -- Peter Schneider (USA)
 514853 -- Don Holmgren (USA) -- PrimeNumberCurta
 514860 -- Lloyd Loring (USA)
 514884 -- Waldbauer Helmut 
 514939 -- Andrew Prusek (AU)
 515108 -- beck
 515191 -- Patrick Sellhorn F. (Spain)
 515300 -- Dana G. Tremblay
 515373 -- Robert Kimble (USA)
 515604 -- John William Backs
 515693 -- Henry F. Tutt
 515728 -- Pam Shack
 515737 -- Skip Hudspeth (USA) -- PrimeNumberCurta
 515853 -- Michael Schmitt (Germany)
 515906 -- Peter Hobbs (UK)
 516039 -- Anibal Rivera (Colombia)
 516080 -- Harold W. Harmon
 516172 -- Duane Heller (USA)
 516257 -- Steve Hossner (USA)
 516319 -- Mark Summers (USA) -- PrimeNumberCurta
 516493 -- Arndt Fiedler (Germany)
 516727 -- Richard De Saussure (USA)
 516792 -- Diego Matias Galera Simon  (Barcelona - Spain)
 516815 -- Peter Hobbs (UK)
 516839 -- Clay Castleberry -- PrimeNumberCurta
 516845 -- Don Speray (USA)
 517043 -- Jan Katuza (Poland)
 517064 -- Peter Hobbs (UK)
 517106 -- Alan Carter (UK)
 517170 -- Jim Milstein 
 517305 -- John Favill 
 517327 -- R.S. Clymo
 517558 -- TomsCollection (Switzerland)
 517561 -- Joseph Williams
 517923 -- Harry Ward -- USA
 517934 -- Dr. Sid Kolpas 
 517987 -- Scott Harvey, Jr. 
 517994 -- Steve Terry 
 518144 -- Robert G. Baumann (USA)
 518330 -- Robert Adelstein 
 518485 -- David Owensby 
 518518 -- Glenn Herman 
 518556 -- Mike Rowley
 518745 -- beck
 518792 -- Pepper S. Younts 
 519306 -- William B. "Skip" Freely 
 519416 -- Keith Hall (UK)
 519445 -- James Black 
 519463 -- Karin Kessler (CT, USA)
 519983 -- Leland May 
 520008 -- Craig Mac Innes 
 520292 -- Alejandro Fernandez Jr (USA)
 520726 -- John Pountney (UK)
 520730 -- Steve Willey (USA)
 520886 -- Dale Intolubbe (USA)
 520745 -- Peter Mabey 
 520854 -- Charles L. Webb 
 520918 -- Gary Morlock (USA)
 521043 -- Roger Warling 
 521094 -- Ralph Beckman (USA)
 521217 -- Veselin Tsankov (BG)
 521240 -- Veselin Tsankov (BG)
 521415 -- Steve Lower
 521603 -- Larry Walsh -- PrimeNumberCurta 
 521802 -- Rick Bensene
 321927 -- Robert Brower
 522000 -- Ben Wright (USA)
 522220 -- beck
 522390 -- David Kahn (USA)
 522528 -- DennyHardy (Europe)
 522545 -- George Huffman (USA)
 522586 -- Carlos Alberto Pedrosa (Brazil)
 522682 -- Wilson Laidlaw (U.K.)
 522727 -- David Senkfor(USA) 
 522769 -- Mery Christophe 
 522934 -- Ralph Beckman (USA)
 522954 -- Lee Sorenson
 523053 -- Barry Sale (USA)
 523080 -- B.R.Nivreg (Germany)
 523129 -- Douglas Palenshus--sold in 2001 to Bellevue, WA enthusiast 
 523229 -- Josh Fisher
 523350 -- Allen & Jan Gunzelman (USA)
 523847 -- Keith Ward -- PrimeNumberCurta
 524061 -- Nigel Watkinson (UK)
 524082 -- Jerry Walker (USA)
 524121 -- Ivan Recman (Czech Republic)
 524175 -- John Hinkamp
 524265 -- Hiromi Chiyoda 
 524266 -- Ruben Barros (Argentina)
 524336 -- James H. Glueck 
 524391 -- Joe Mc Glohen 
 524581 -- Rod Sorenson 
 524619 -- Stephen Glover 
 524901 -- Jaap Wessels (The Netherlands)
 524957 -- Adam -- PrimeNumberCurta
 525059 -- Dov Gadot 
 525190 -- Scott Sprague 
 525329 -- Nick Chapman
 525532 -- Jim Dragoset (USA) 
 525581 -- Steve Castleberry 
 525601 -- Dave Wheeldon 
 525638 -- Del Andreini 
 525645 -- Les Talcott (USA)
 525897 -- Javi Castillo (Murcia - España)
 525929 -- beck
 526143 -- Les Talcott (USA)
 526157 -- Louis Skelton, Curator at The Keenan Collection -- PrimeNumberCurta
 526339 -- Allen Berman
 526406 -- Grant Paton
 526469 -- Bob Fankhauser (USA)
 526470 -- Walter Picco (Italy)
 526640 -- Alex Poylisher (USA)
 526651 -- Steve Green (UK) -- "TwinPrimeCurta";  the higher of its twin prime 526649
 526671 -- Rico Molendijk (The Netherlands)
 526699 -- Rick Furr -- USA
 526879 -- Pete (Germany)
 526883 -- Jerry L. Sokol (USA)
 526929 -- TomsCollection (Switzerland)
 527054 -- Ramon Fregoso
 527180 -- Julian Alejandro Lell (Argentina)
 527206 -- Dan Hopkins (Canada)
 527207 -- Gerard F. Schaefer (USA) -- "TwinPrimeCurta";  the lower of its twin prime 527209
 527229 -- Donald Irwin-Harris (USA)
 527348 -- Mark Butterworth
 527369 -- Dave Aitchison (Australia)
 527430 -- Wesley Dunnahoo (USA)
 527534 -- JackChristensen (USA)
 527846 -- beck 
 527928 -- Larry Scott (USA)
 528118 -- Matthew Presnal 
 528184 -- Herb Gold (Demo model)
 528229 -- David Senkfor (USA)
 528397 -- Bob Lockey 
 528478 -- Steven C. Ross (USA)
 528533 -- Steve W. Nichols (USA)
 528671 -- Dave Hammelef (USA)
 528684 -- Michael L. Harmon (USA)
 528756 -- Billie G. Smith 
 528813 -- Fred Kroll 
 528863 -- Stephan Fricke (Germany) --  PrimeNumberCurta
 528872 -- Herb Engstrom 
 529055 -- Peter Hobbs (UK)
 529069 -- Alfred Werra 
 529115 -- Markus Rustemeyer
 529515 -- Jorge Victoria (Argentina)
 529659 -- Paul Van Hoof 
 529668 -- Donald Rosen (USA)
 529687 -- Harold Mernick
 529860 -- Francisco Ruiz (Mexico) pena2528@hotmail.com
 529969 -- Robert Brower
 530023 -- Charles M. Howard
 530048 -- Anibal Rivera (Colombia)
 530070 -- Mike Daley
 530155 -- Registered Land Surveyor 
 530498 -- Les Kerr
 530683 -- Ulf Ergander (Sweden)
 530705 -- beck 
 531123 -- Cris Grunca
 531203 -- Paul Catchpole (New Zealand) -- PrimeNumberCurta
 531264 -- Gary Williams (UK)
 531280 -- Nicola Montanaro (Italy)
 531323 -- Yannick Rey (Switzerland)
 531439 -- Ron Ontell (San Diego, California, USA)
 531501 -- Alfredo Logioia (Argentina)
 531606 -- Beck
 531821 -- Dave Hammelef (USA) -- "TwinPrimeCurta";  the First of its twin prime 531823
 531827 -- Wolfgang Deppenmeier -- PrimeNumberCurta
 531993 -- Jay K. Jeffries  
 532235 -- Robert Cailliau (European Union)
 532504 -- Martin Conrads (Germany)
 532649 -- Jim La Rue (USA)
 533039 -- Tadamitsu Gamazawa 
 533144 -- Michael Seedman (Chicago, Illinois, USA)
 533334 -- Shelley J Fawcett (South Africa)
 533418 -- L. Verity
 533801 -- Pete (Germany) -- Black Curta II with black/red knobs
 533794 -- Mike Munn (UK)
 533914 -- Robert A. Pearce 
 533946 -- Jo & Jim Hurley 
 533953 -- Harrie Wolters 
 534332 -- Stuart L. Wayne 
 534385 -- Michel Miklaszewski 
 534433 -- Bill Hood
 534762 -- Helge Reisch
 534911 -- Eric Cee (Germany)
 535153 -- Doug Thiedecke 
 535297 -- Nick Ridgeway 
 535469 -- Pearu Terts 
 535535 -- James Weightman
 535597 -- Jake Cravino (NSW Australia)
 535630 -- Matthew Smith (UK)
 536087 -- A. B. Bonds 
 536131 -- David Bannister
 536131 -- John H. Eells
 536161 -- Daniel Gross
 536176 -- Chuck Cavanaugh
 536438 -- Scott Norton (USA)
 536680 -- Warren Hart (USA)
 536689 -- Ira Meislik 
 536734 -- Ken Whitson
 536759 -- Rich Scholl
 536848 -- Gordon Ball (USA)
 537078 -- Adams Douglas 
 537463 -- Robb Brinkley (USA)
 537665 -- Adam & Natalia Kasprzak (Poland)
 538236 -- David Bannister
 538310 -- Pepper S. Younts (USA) 
 538365 -- Paul Krisman 
 538415 -- Lawrence E. Maier (USA)
 538416 -- Peter Hobbs (UK) 
 538446 -- Chad 
 538631 -- Denis Nicholls (UK)
 538659 -- Tony Brown (USA)
 539033 -- E Mc Erlean (UK)
 539041 -- Dennis Farr 
 539157 -- Tim Humphries
 539233 -- Donald Rosen (USA) -- Prime Number Curta 
 539261 -- Pat Huet 
 539399 -- Joseph A. Charles 
 539451 -- Steve Richards 
 539461 -- beck
 539464 -- David Senkfor (USA)
 539629 -- Kirby L. Crawford
 539787 -- Leo Theron 
 540329 -- Charles G. Hanson (USA) 
 540430 -- Mark Crocker
 540681 -- John Bellefleur (Canada) 
 540738 -- R Monaco 
 540782 -- Jim Walpole (UK)
 540972 -- beck
 541045 -- Carlos Alberto Pedrosa (Brazil)
 541163 -- Grant Youngman 
 541172 -- Franz Schuler 
 541184 -- Jonathan Wall 
 541447 -- Ed Lake
 541599 -- Eric Teutsch
 541614 -- Thomas Mc Namara (USA) 
 541633 -- Miki Mihajlovic 
 541735 -- Joe Webber 
 541758 -- David Kay 
 541792 -- Ryan Davenport (Canada)
 541833 -- Mark G. Leonard 
 542072 -- Roger David Coleman
 542322 -- Lloyd Albright 
 542379 -- "skeleton" model
 542539 -- Guy Rowinski 
 542608 -- James Mc Dermaid 
 542826 -- Lin Hsin Hsiung 
 542883 -- Bill Drude
 543040 -- Rick Trafford 
 543126 -- Robert Hinchley (Canada)
 543169 -- Ed Sharp 
 543190 -- Allan Gough
 543379 -- Thomas Mc Namara (USA) -- PrimeNumberCurta
 543402 -- David Bannister 
 543471 -- Reyn Rich
 543601 -- Roy Miller (USA, Wisconsin)  -- PrimeNumberCurta
 543622 -- JackChristensen (USA)
 543652 -- Peter Johns 
 544167 -- Gary D. Snyder
 544430 -- Peter Hobbs (UK) 
 544447 -- Robert R. Kim
 544565 -- beck 
 544631 -- Cris Vande Velde (DE)
 544738 -- Nico Groenewegen (Netherlands)
 544783 -- Steve Richards 
 544857 -- Nigel R. Tomlinson 
 544911 -- Benson Miller
 545033 -- Pat Doak -- "PrimeNumberCurta"
 545098 -- John Pountney (UK)
 545430 -- John Low-Shang 
 545522 -- Kerry Kyriacou (Australia)
 545545 -- Roger Kingsley (Canada)
 545546 -- Ron Goldsack
 545619 -- Herb GOld
 545773 -- William J. Schull (USA) -- "PrimeNumberCurta"
 546015 -- STeve Zweig, Los Angeles, CA
 546126 -- Carlos Alberto Pedrosa (Brazil)
 546167 -- Antonio De Leonibus (Italy)
 546251 -- Al Axelband (USA)
 546283 -- Mohammad hamideyn 
 546616 -- Nathan Orenstein 
 546671 -- Chris Gillings -- "PrimeNumberCurta"
 546692 -- John Cherry 
 546763 -- Rudy Penteado
 546788 -- Daniel Quiroga Kalkstein (France)
 546850 -- Graham Nash (Australia)
 546874 -- Harrison Spain (USA)
 547112 -- Martin Strange (Canada)
 547205 -- Susan Bastian (USA)
 547210 -- Eyal Eckstein
 547347 -- Claudio Abaecherli
 547670 -- Giovanni De Pasquale (Switzerland)
 547680 -- Jacob Mercer (UK)
 548103 -- Stan Alter 
 548268 -- Yves Drillet 
 548379 -- Jami Buchet 
 548507 -- Neal Sloane (USA)
 548726 -- Lorenzo Altese 
 548658 -- Mike Suranyi, Citrus Heights, CA (USA)
 548914 -- Nat Edgar >> Jacky Young Scotland
 549518 -- Mery Christophe
 549594 -- Etienne Pommel (France)
 550038 -- Tim Udall (USA)
 550040 -- Wayne Loudermilk
 550092 -- Dr. Brian Levy 
 550120 -- Stan Stanley (USA)
 550125 -- James Bowlin
 550234 -- John Pountney (UK)
 550682 -- Anthony Martin (France)
 550865 -- Jim Weil 
 551014 -- JackChristensen (USA)
 551183 -- Juan S. Perez Diaz 
 551188 -- Walt Kammer (USA)
 551378 -- Donald Rosen (USA)
 551663 -- Rod Sorenson 
 551666 -- Dufour Remy 
 551752 -- Philip Twine 
 551892 -- Pasquale Milano (ITA) 
 551956 -- Mery Christophe 
 551957 -- Mery Christophe 
 552457 -- Nick Pritchard 
 552808 -- Steve Richards (USA)
 552842 -- David Beazley
 552856 -- Dr. Jeffry Luria 
 552899 -- George E. Heath
 553266 -- Gordon Matzigkeit 
 553304 -- Corry Kerstens
 553385 -- Phil Symons 
 553479 -- Mike Krassenburg (Netherlands)
 553673 -- Eugene F. Hari
 553720 -- Stephen Hunt 
 553736 -- Daniel Kuras
 553755 -- Daan Buis (Netherlands)
 554056 -- beck 
 554758 -- Doug Boone 
 554764 -- Tim Winker (USA)
 555017 -- Jorge Tadeo Rojo (Argentina)
 555268 -- Malcolm Brooks 
 555251 -- Dave Coppard -- PrimeNumberCurta
 555406 -- Donald Rosen (USA)
 555476 -- Sebastian Dammers
 555450 -- Alan Erikson (USA)
 555708 -- Yu Liu (USA)
 555718 -- Henrik Starholm (DK)
 555827 -- Jon Teague (UK) -- "TwinPrimeCurta";  the First of its twin prime 555829
 555858 -- TomsCollection (Switzerland)
 556023 -- R. Brian Andrews (USA)
 556031 -- Maciej M. Syslo (Poland)
 556053 -- Max Hyre (USA)
 556074 -- Michel Haebrard 
 556217 -- Hector M. Resendiz S. (Mexico)
 556327 -- Frederick (Rick) Ide
 556407 -- Scott Bissett (USA)
 556951 -- Lazare
 557019 -- Albert Wong (USA)
 557055 -- Scott Allendorf (USA)
 557211 -- Kamala Krishnan
 557358 -- Ted Taylor
 557360 -- Donald Rosen (USA)
 557409 -- John Isham (USA)
 557522 -- Nigel Brasok (Canada)
 557607 -- Donald Rosen (USA) (Demonstration model)
 557643 -- Neal Sloane (USA)
 557727 -- Gail Oliver
 557755 -- Steve Englebrecht (USA)
 557754 -- Ken Seydel
 557762 -- Hull Family 
 557842 -- Marcel Chichak 
 557864 -- Dushan R. Divjak 
 557879 -- Mery Christophe 
 557889 -- Bob Barns 
 558006 -- Douglas Hicks 
 558025 -- Ken Wiedbusch 
 558039 -- John Grannells
 558124 -- Bill Taylor A.S.C.
 558135 -- Ric Goldtrap TSCC
 558189 -- JackChristensen (USA)
 558273 -- Shalom (Dick) Tsur, Ph.D.
 558275 -- Peter Hobbs (UK)
 558277 -- Donald Rosen (USA)
 558284 -- Rich Bireta (USA)
 558285 -- James Osborne (UK)
 558391 -- Bryn D Owens (UK) 
 558399 -- Gary Caplin 
 558419 -- Paul S. Pace, P.L.S. 
 558449 -- Alfredo Logioia (Argentina)
 558450 -- Nigel J S Steward 
 558512 -- Tom Poole
 558551 -- Sean Tudor
 558647 -- Donald Rosen (USA)
 558662 -- Peter Hobbs (UK)
 558711 -- Pepper S. Younts (USA)
 558761 -- Eric Norman 
 558939 -- Herman Brauckmann 
 559404 -- Curt Harpold (USA)
 559891 -- Ken Sanford (USA)
 560051 -- Felix Schaefer
 560177 -- Tobi Brenner (Germany)
 560209 -- Charles Lawson (UK)
 560538 -- Luke Fiebig (USA)
 560566 -- Thomas Stocker 
 560608 -- Dr. Rutger Verbeek
 560675 -- Donald Rosen (USA) 
 560754 -- David D. Stone Sr. 
 560780 -- Christopher Kaine
 560781 -- Prof. Emeritus Robert A. White (USA)
 560809 -- Roy Levin (USA)
 561026 -- beck
 561213 -- Andrew Koenig
 561254 -- Donald Rosen (USA) 
 561314 -- David Owensby
 561417 -- Peter Hobbs (UK) 
 561447 -- Pepper S. Younts (USA)
 561477 -- Carlos Navalón (Barcelona - Spain)
 561501 -- Mandi (Germany)
 561555 -- beck 
 561583 -- TomsCollection (Switzerland)
 561653 -- TomsCollection (Switzerland)
 561655 -- Werner Schaefer