Curta Model1 Curta Model1There are two major variations of the Type I : early (EarlyModel1) and late (LateModel1) versions.
The early models have a metal crank and metal clearing lever, and came in a metal carrying case. In the mid 1960s Contina changed to a plastic crank and plastic clearing lever, and supplied a plastic carrying case.
The factory phased in such changes (both the major version changes and minor component changes) over time. As a result, there are many "halfway" versions. It is these units that often spark extreme interest in collectors.
Additionally, a LeatherCase was produced and was available as an accessory.
The general specifications for each version are the same.
| Model | Type 1 |
| Keyboard | 8 x 6 x 11 |
| Data Entry Register (Multiplicand) | 8 digits |
| Crank Turns Counter (Multiplier) | 6 digits |
| Result Register (Product) | 11 digits |
| Add or Multiply to | 11 places |
| Divide To | 6 places |
| Diameter | 2 1/16 in. (53 mm) |
| Height | 3 3/8 in. (85 mm) |
| Weight | 8 oz. (230 g) |