I'm looking to purchase a 1920s era rollfim Voigtlander with a lens I haven't come across before, nor can I find it in on-line and available literature. I know the 10.5 Skopar 4.5 is very common... but this camera has me stumped. It's rollfilm, not plate, and has dial-set Compur shutter. Lens clearly says 1:4 not 1:4.5.... and there's no aperture selector to be found. Camera back has single red window, key-turn film advance.. no knobs of any kind. At present moment I have not seen camera in person closeup; the seller needs to find key for curio cabinet ! Any thoughts about camera model name and if there is such an animal as a 10.5cm f/4 (NOT 4.5) Skopar in a dial-set Compur shutter ?? No Inos I or similar 1926-31 rollfilm Voigtlander looks quite like this one. It has a white focus scale like a VAG plate camera, no up-down movements, though.... I think wire frame viewfinder is missing or broken. There is a mention of a "Beatrix" model, but can't find any pictures of this specimen. This is my first post on photo.net... most of the time my questions have already been answered... great site !!