LOMO (CKBK) super wide angle lens OKC6-10-1M 2.8/10mm, Konvas/Kinor OCT-19
The lens was made is 1988 (#880004). f/2.8, T/3.2, F=10mm.
One of the widest possible lenses for 35mm film format.
Front glass is fine. Rear glass has wear of coating in the center.
Aperture ring moves smoothly. Focus ring is absent since the lens has hyper focus and doesn't need to be focused.