Canon FD 35mm F2 Lens Not Working

Serial Number: 33435

Lens only. No caps.

Cosmetic Condition: 7/10
It shows signs of use.

Optics: 9/10
The lens has a few cleaning marks and dust specks inside. It is free of haze and fungus.

Mechanics: Needs repairs
There’s a problem with the mount: we weren’t able to mount the lens on a camera. The aperture ring moves smoothly but does not make a sound when moving from one stop to another. Focus ring moves smoothly between 2.5 ft and infinity but it’s stiffer when closer than 2.5 ft (focus still works).