The 650B Randonneuse frame that I won on ebay months ago (for a few Euro) arrived today. It is in better shape than I thought.
The only mark on the bike is a hand punched serial number on the bottom bracket: J5160 The BB also has "57" on one side and "AFY" (or AFV) on the other side.
The seller thinks it is a mid-30's frame. Nice lugs, every braze-on possible (except for bottle-bosses), through frame cabling,...
Anybody out there with a similarly marked Bottom Bracket?