This is a large aperture standard lens based on the optical system of the FL 55mm f/1.2. Despite its large aperture lens, it is highly reputed for its high contrast and stabilized image delineation at full aperture opening. Because of its fast f/1.2 lens speed, it provides high image qualities in low light level photography. Its optical performance is similar to but more advanced than the FD 50mm f/1.4 S.S.C. because of its faster lens speed. Moreover, Canon has compensated for various aberrations, i.e., spherical aberration and coma. Its marginal shading performance is outstanding.
More info here.
The lens with caps.
Cosmetic: The glass is super clean, the body has a bunch of wear. There is a small bit of paint missing in a few spots.
Optical: Free from haze/fungus/scratches.