Carl Zeiss Jena Tessar 50mm f/2.8, a leather-wrapped model. M42 mount. There are no major noticeable scratches on the exterior, but there are some small paint chips, so please check the photos. The focus ring has a good feel. The aperture ring also functions without any problems. No oil on the aperture blades is visible. There may be some dust particles, but I don't see anything concerning, including mold. *For convenience, I have selected K-mount, but it is an M42 mount. I used it with Canon and Pentax cameras via an adapter. *This lens is suitable for personal use and does not have any issues, but please understand that I cannot provide any warranty. No claims and no returns, please.