Vintage calculating machine 1930

To change high-tech devices here is a real vintage object that comes straight from the past: old manual calculating machine from 1930 in metal Vaucanson model Ava 13t workshop chauvin. dimension: 35 cm (unfortunately impossible to send: it is very heavy) I could not explain to you how to use it... It comes from a grandmother's attic... It is in its own juice (see photos ) (estimated between 200 and 400 euros) For an original vintage industrial retro decor.

Ref. : BHRTYYV8