This a 100mm f/2 anamorphic projection lens made by Schneider-Kreuznach. These lenses are popular in 35mm cinema projection as well as filmmaking. It is popular to modify them to an anamorphic cine lens to achieve unique shots.
The glass in this lens is absolutely perfect, no marks, fungus, or blemishes of any kind. The brass housing of the lens is scratched on the barrel where it clamps into a projector, which is common in these lenses and only a cosmetic flaw.