This is a Leica 250mm F4.0 Telyt-R (V1 TWIN CAM). It can be used on the Leicaflex, Leicaflex SL & Leicaflex SL2. Code no. 11920. Serial No. 2406277. Circa 1970. It uses Series VIII (8)  filters. Cosmetically there are no major dings or dents. There is a slight mark on the hood, a tiny scratch. Optically the glass is clear but has dust consistent with age. Comes with front & rear caps