Today I stopped by an estate sale and it just happened to be of a late photographer. Unfortunately, the Leica was already gone (sold for 75$!). I did find this unusual camera and I have heard very little about it. It is a Primaflex made by Curt Bentzin, Gorlitz This is a nice SLR made in the 1930's. This one has a nice Meyer Trioplan f2.8 attached. The mount is a simple screw mount. The shutter speeds have settings from 1-1/1000 with T and B. There is also a self timer. The shutter is a vertical cloth blind similar to that of a graflex. Unfortunately, the shutter does not seem to raise to it full height, so it only exposes half the film. And the shutter seems to only fire at a fast speed. I dont want to blindly go into it. Has anyone taken it apart? SLR's are horribly complicated. Does anyone have any information about it? there is one knob (bottom right) that has arrows that indicate it should turn, but I cannot get it to turn.