Nice early Campy Record rear derailleur, patent pending. I believe this is first generation. Has the steel smooth jockey wheels. Really should put it on my Chicago Paramount, but I need to let stuff go! I have been collecting and restoring vintage bicycles since the 1970s. Should have bought the stock back then. I have a FB page dedicated to my collection and restorations, billsvintagesteelbikes. Bills Vintage Steel Bikes.