Mechanical calculator with crank

The mechanical calculator has a dark metal body, light green keypad, rows of number keys, upper mechanical cylinder and side crank. Digits are visible in several coloured rows on the keypad, with further setting elements on the right. Scuffs, dirt, oxidation and patina are visible on the metal, keys, cylinder, crank and edges.

Code: ot12100
Category: Electrical
Period: 1940s, 1950s
Material: Metal, Plastic
Colour: Black, Green, Beige, Silver