Hey! That's my old bike!!! The Golden Boy.





(Just kidding.). :lol:

You don't need to replace the DO (on or both) there is a genuine Campagnolo hanger bit that's made to repair this "drewed" example. Now the challenge is finding one of THOSE (and the repair shop to braze it). The handlebars with molded-on "pleather" hoods and wrap, most likely the Philippe stem as well, are straight off a late '70s or early '80s Motobecane. Too bad such a nice frame has been mishandled, now you can show it that TLC it deserves.

Canpagnolo 1010a dropout
often described the same with or without the threaded eyelet.

so, what is lurking underneath that hardware store of a seatpost binder bolt?
also, looks closed up to me- my guess a 26.6 that was closed to accept a 26.4 post