not sure what you mean by vertical folding camera not being 6x9.
IMO it's the opposite. You must select 1/400 before you cock the shutter.Just do not change the shutter speed from 1/400 to a slower one with the shutter cocked. That's a no-no.
the red windows on back are frame counting, obviously. YOu use the one nearest the end of the camera with thekey that winds the film for shooting. If you have/are using the insert for the camera that converts it to 4 by 6 (half frame, 16 shots per roll instead of 8) then you use the lower window first.
Some of us just cover up the unused window with back tape to avoid confusion.
Voigtlander had a small mask that fit into the film chamber. It converted the camera to 6x4.5. Obviously, you can't make the change mid-roll.
What this does is give you a 6x4.5 camera with a short telephoto lens. Most 6x4.5 cameras from that era had a "normal" lens of 70mm to 80mm.
Compur is the name of the shutter, not the lens. You should have a Skopar (Tessar type) lens on the camera.
You should test the camera with film. The Voigtlander has a reputation for having a lens yoke that can be prone to damage. In fairness, any camera that is dropped might not ever give you a sharp photo again.
Edit: I see that you tested the camera ...
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