Here's the thing. I've got a Geiss-modified Argus C4 and two lenses, a 50mm Cintar and a longer lens with a screw-on hood. Unfortunately the shutter is dead. For those who aren't familiar, an Argus C4 is a US-made rangefinder from the late 1950s. It is a step above the old "brick" in aesthetics and ergonomics. (But that may be a matter of taste. There is something ineffably brick-like about the brick.) Geiss modified the A4 to allow the lenses to be interchangeable. The Cintar is the standard three-element lens, that was reputed to be decent. I'd love to have a working Geiss-modified Argus C4 to try the lenses on. At least the 50mm Cintar. I'd trade the non-working body, plus either a decent regular C4 or a shabby but working C44 with a Cintagon lens, just to get the Geiss one working. I'll run a roll through it and then put it back in the pool.