LOMO 2/50mm lens OKS1-50-1, OCT-18 Konvas mount, #731487
The lens was made at famous LOMO factory in 1973 (#731487).
It has so called OCT-18 mount to fit turret Konvas cameras (for 35mm film). But the lens covers larger area, including full still image 35mm frame (24x36mm). On the other hand, back focus is quite short, so it will not reach infinity focus on SLR cameras. But it will work fine on modern hybrid (non-reflex) digital cameras.
Excellent condition. Mechanics work fine. Aperture ring has click stops. Glass has some dust particles and few tiny cleaning marks that will not affect image quality. Quite much oil on diaphragm blades.