Medium Cage Rear Derailleur. Up for sale is a New Old Stock (NOS) Campagnolo Record 10-Speed Rear Derailleur (Model: RD4-REXM), in brand new, unused condition. This classic derailleur from Campagnolo’s Record series offers smooth shifting, lightweight performance, and Italian craftsmanship, making it a perfect addition for collectors or vintage bike enthusiasts. Model : Campagnolo Record 10-Speed Rear Derailleur Medium Cage. Condition : New Old Stock (NOS), never used. Made in Italy : Iconic Italian design and precision. Whether restoring a classic bike or upgrading your drivetrain, this derailleur offers exceptional performance and style. A rare find in brand new condition, still in its original packaging.