This model that I have is a Retina II … not to be confused with the Retina II. Whaaaaaaat?
The Retina lineup had a I, II, I, II, and III version. One interesting thing about the Retina model naming … they restarted from I after the war, so you will find Retina I/II pre-war and Retina I/II post-war. Mine is a II pre-war model made between 1937 and 1939. Another thing is that there were various submodels typically designated with Nr/Type which is not marked on the camera itself.
As I mentioned before, the Retina is a German design camera. This model has a Schneider Retina-Xenon f:2.8 5 element lens. The Retina I models were viewfinder scale focus cameras. The Retina II was the first rangefinder produced by Kodak AG.
The first model, 122, had an advance lever … but it was quickly replaced with a knob with the 142, I guess there was an issue with the original design.
Kodak AG made over 25 folding Retina models alone … and each having different lens variations … so if you want to collect them, be ready to build a big shelf.