Ferrania Zeta Duplex

The camera that smiles and makes you smile.
A metal box camera with fixed focus lens, three apertures (16, 11 and Full (I guess)).
Two shutter speed settings B and I (instantanous) I have not yet tested the actual shutter speed for I but probably something in the 1/30th - 1/50th range.
Frame size is either 6x9 or 6x4.5.
For the smaller size it has a hinged mask that you can't lose. Great idea because most of the dual format cameras I have seen have the reduction mask missing.
Duplex in the model name certainly refers to the dual format.