Esacta
An interesting, late Italian pinwheel calculator, which is typical for the final refinements in pinwheel calculators in the 1950s, as well as the budding office machine industry in Italy (think Olivetti!) -one hand carriage movement, coupled with a twist knob on the front of the carriage, back transfer of the result ("Reimpostazione"), and a very light action of everything. To compensate for the small weight of the machine, it has a full rubber footprint, so it doesn't slide all over the table when operated. The pinwheels are composed of pressed pieces, and not cast and machined brass - see the pictures below.
A very well thought out machine, and if we can believe the serial number, quite a lot have been built. I can't help but think that the numbering may have been a bit optimistic though, or more of them would have surfaced. As can be seen from the example in the pictures above, also a model exists without back transfer from the result to the input.
