The Curta was produced in two basic models:
There are three major variations of the Type II : black body, grey body, and grey body with plastic crank and plastic clearing lever. The black body Type II looks more like the Type I because the main body is all black. All black body Type II's came with a metal crank and metal clearing lever. In the late 1950s, Contina started producing the Type II with a grey crackle painted body and collar. These Curtas continued to have metal cranks and metal clearing levers until the mid 1960. Then, as with the Type I model, the grey Type IIs were supplied with plastic cranks and plastic clearing levers.
The factory phased in appearance changes over time. As a result, there are many "halfway" model variations. It is these units that often spark extreme interest in collectors...
|Model||Type I||Type II|
|"Entry/Counter/Results" Readouts||8 x 6 x 11||11 x 8 x 15|
|Data Entry Register (Multiplicand)||8 digits||11 digits|
|Crank Turns Counter (Multiplier)||6 digits||8 digits|
|Result Register (Product)||11 digits||15 digits|
|Add or Multiply to||11 places||15 places|
|Divide To||6 places||8 places|
|Diameter||2 1/16 in. (53 mm)||2 9/16 in. (65 mm)|
|Height||3 3/8 in. (85 mm)||3 5/8 in (90 mm)|
|Weight||8 oz. (230 g)||12 1/2 oz. (360 g)|