訳あり Carl Zeiss Jena Tessar F3.5 50mm Junk Exakta mount. I apologize if I'm mistaken. Please check the photos. Photos 9-12: There is mold on the edge of the lens. Photo 13: The aperture only closes this far. There is some dust and debris. Stored at home. Please refrain from purchasing if you are nervous or concerned about minor details as this is a used item.