The Sears MC 60-300 mm f/ 4-5.6 mod. no. 202.7368300 is a telephoto manual zoom lens for SLR cameras.
The lens is all-metal.
Though the bayonet is equipped with a contact pin, the lens is compatible with Sears film cameras only (subject to confirmation). This pin is likely to prevent the lens from mounting on cameras equipped with AF screwdriver: the pin gets stuck in the AF screwdriver. The pin should be removed (follow the instruction at http://forums.dpreview.com/forums/read.asp?forum=1036&message=19214685).