Manual focus normal lens made for Exakta/Topcon mount 35mm SLRs, made long after the release of the Exakta mount in 1936. Likely made by another company, like Cosina. Metal body available in black.
Topcon cameras have the inner Exakta bayonet. The Topcon bayonet is fixed to the camera with four little screws, just as the Exakta mount, but their positions are different. So these systems are not fully cross-compatible.