This camera was sold as a fake. In fact, the reality is more complex.
The mechanism (rounded sensor release spring), the shoe (inside guide), the belt (colour of the vulcanite) and the lens (serial number) come denote a 1934 Leica II Couplex. The cover and the plate are from a Fed (or Zorki) camera.
My guess is that the original Leica was damaged and then repaired with FSU parts.
(Jacques M. collection)