(Canon-R/FL) Kimunor 400mm 1:6.3 (B-GRADE) [820796]

Second-hand telephoto lens with a Canon-R mount, used in the first 35mm SLR cameras done by Canon (Canonflex). The mount features no pin, and can be used on more contemporary analog cameras from Canon as a fully manual lens. 
The lens has not passed a full quality control and has following defects:
- stain on second top element. this becomes visible under an angle. We are not sure if this will affect pictures taken with it.

-the second aperture ring (under the steps) sometimes needs more force to close