This is a nice telephoto zoom lens for Canon FD cameras. It will not work on modern cameras without an adapter, but it would make an excellent addition to an FD film kit especially. Use it for sports, wildlife, or even portrait photography.
This one is in good cosmetic condition but there seems to be a light haze and some spots where liquid has dried behind the front element (see photos). The focus is also stuck between infinity and ~5ft, the lens will not focus closer than that and the focus is decently stiff.