Vintage Schwinn Sprint Rear Derailleur Fastback 5-Speed Bike

This original Sprint derailluer was typically found on early generation Schwinn Fastback bikes in addition to other 1960's Schwinn models such as the Super Sport, Continental, Varsity and Collegiate.  The cages are straight and the pulley wheels spin freely. The overall condition of this item is consistent with its age - p lease review all pictures for more details .  S hipping provided to the Lower 48 States in the US only.  Questions welcomed and encouraged.