Very nice clean Yashica ML series 50mm f/2 lens.  Camera just thrown in but actually operates nicely.  Yashicas had good metal bladed shutters that have stood the test of time.  Back to the lens is the ML series which was their nicer lenses and is the same people that made the Carl Zeiss lenses for the Contax cameras (that they also manufactured).  I've got another Zeiss version for sale as well (if it's not sold yet).  Just check my listings.