This Schwinn GT 500 derailleur was removed from a 1977 Schwinn varsity. It woud fit Continental, Surburban and others. It is in fair to good condition, with light scuffing on the front and a small amount of rust on the chain guide (best seen in picture 2). It is labelled Schwinn Approved and has the marking Brevette SGDG. As it is 43 years old, I am selling it as is with no returns. No international sales. Thank you for looking and please stay safe.