Here is the logo of the Piseroni & Mondini company:

Hello, Which is the serial number
Mauro

Below the photos

From:
http://www.rolleiclub.com/thedarkroom/?page_id=3583
1.102.000 1.135.999 Rolleicord II model 6 Rolleicord IId Rolleicord II (type 5)

Hello, someone would know who the builder of this stereoscopic viewer is
I can say that it belongs to the Soviet Union
thank you
Mauro

Here is the 13 x 18 plate model from Lamperti & Garbagnati.

Hello, Ok it looks original, this from my collection,
maybe the knobs have been redone?
Mauro

This is the stereoscopic camera model, for export

Here is the Leica M-E

Thank you, Merry Christmas to you and to all the members