Calculator with case and instructions, addiator type, Correntator, metal / leather, made by Continentale Buroreform (CBR), Berlin, Germany, 1920-1930
Correntator adder, Addiator style calculator in leather note-book fold case with instructions.
Missing stylus. There is a flap of metal hinged from the centre that swaps the function from addition to subtraction.
'Correntator' Stylus Operated Adding Machine
Source: Permondsey Market, London. 1981 / 3 / 13
Large pocket size stylus operated adding machine. Metal construction with flap to change to subtractive markings. Capacity L999,999/19/11 ¾ . In card case.
Good working order. Some surface damage. Missing stylus. Claimed by dealer that he bought this when about 8 years old, and lost the stylus the same day. He remembers the stylus as having a hooked form, and incorporating a propelling pencil in the other end.