Voigtländer Heliar 3.5/55mm made in 1934. I removed the complete lens and shutter out of the camera, so it is possible to replace it again any time. It were mounted in a 127 format camera and Voigtlander were the only company which uses 55mm lenses for it, all others are used only 50mm lenses and this ones have often problems to cover the full frame of 30x40mm with a ral good quality. This short Heliar is only find in a vintage Perkeo 3x4 but very hard to find, the mount used lenses in this cameras wer the Voigtar and the Skopar.
I used a Leica Nooky close up focus mount, with it I can gave the lens a correct cam for a Rangefinder camera, it were a little bit difficult but it works, I use this gem with my Sony A7.