1957 Campagnolo Record Front Derailleur: 1st Year! 1052/1 - Flat Head Pivots - No Slot Cable Stop Chrome Bronze Steel Arm (NEAR MINT++) - Bike Recyclery
NOS 1950s-60s Campagnolo #636 Chainstay Cable Stop Clamp for Rear Derailleur | eBay
Chain stop on chain stay does hold cable outer - Cycling UK Forum