Optex 14mm f2.8 prime lens, 35mm format. I believe these were based on Canon FD 14mm lenses - this rehousing done by the defunct (and sadly missed) Optex London, at a guess some time in the late 70s/early 80s.
Good condition for its age. Mechanically sound, with a few minor blemishes to the front element as you would expect from a 40yr old lens. Works very well and the small defects have no apparent effect on image quality.
Often used as an additional wide-angle to supplement Canon's enormously popular K35 vintage lenses - I've done this myself many times and they do intercut well.
Inspection and testing very welcome, also happy to send for inspection to recognised third party optical specialist or rental house (TLS, CVP, Arri etc.).