Vivitar Auto Wide-Angle 28mm F2.5 Canon FD Lens -Read-
Here is a fast wide angle prime for Canon manual focus cameras.
Note that it will not mount on any modern camera without an adapter.
It is in good condition with moderate wear. There are a series of tiny marks on the front element but I can only see them with a flashlight, they won't impact your images. Otherwise the glass is clean with no haze or fungus. The focus and aperture are smooth.