The Unbranded Brand Carl Zeiss Jena for Exakta Tele-Tessar 6.3/12cm lens heavy version

Zeiss Jena for Exakta Tele-Tessar 6.3/12cm lens heavy version Front has a chess united 27MM filter holder with a Kodachrome series V Haze filter installed Aperture and focus styles turn smoothly The lens is dirty from long-term storage. I am not an expert in these lenses and I have made no attempt to clean it other than a light dusting with a microfiber cloth for fear of messing it up. No chemicals were used. See pictures for details and condition