I've been reading about how the Contax camera machinery was moved to the Soviet Union, starting with some Contax-based cameras being assembled in East Germany prior to the machinery being moved east. And the lenses were sourced from Zeiss in Jena, and marked as yours is. This was in the early post-war years, but perhaps at a time when coatings were first being applied. (I got into this because someone was selling a black "Contax II" which is most likely a Kiev faked as a Zeiss camera, though it can be hard to know if it's a fake or not without getting into the shutter mechanism, or so I read.) It would be interesting to know the extent to which well-to-do camera buyers who could afford Contax cameras actually sent their lenses off to be coated, something that very, very few photographers would do today.