This is a vintage Sigma 70-210 zoom lens that my parents had for their Canon AE-1, and it appears unused. It has a 52mm Hoya Skylight filter on it. 

Original Sigma lens case, both front and rear lens caps, lens hood, filter and instruction manuals included.

The SIGMA 70-210mm F4.5 Macro Zoom Lens is a telephoto lens compatible with Canon FD/FL mount cameras. It has a maximum aperture of f/4.5 and a focal length of 70-210mm, making it ideal for capturing distant subjects. The lens is made of rubber and metal and has a manual focus type. It is compatible with 52mm filters. The lens is part of the K-II Zoom series and was manufactured in Japan by Sigma.