This was a grab shot to test out a 1930s Reflex Korelle I'd just bought. It came (in addition to the usual 75cm Victar) with an ancient 12cm Zeiss Tessar lens. The lens was mounted in a brass barrel, yet the Korelle is black and chrome - so not sure if the lens belongs to the camera - but it fits, focusses correctly and it works. Maybe it came off an earlier Korelle plate camera?