I have a 1975 jeunet with italian threaded BB, the BB feels slightly ovalized on the non-drive side, but in anycase I assume it was rethreaded. The bike was painted and had braze-ons added in the mid 1980s so I assume it was retapped at that time, It also have a french threaded headset but at 22.2mm stem fits fine. Another odd quirk is that it appears the threads (at least all the ones which are engauged have been replaced! As in someone brazed on about 2 inches of threaded stear tube. This seemed sort of alarming, but I guess I have been riding it for two years and the previous owner used it for at least 10 after all the work was done in the 80s... so I figure it's alright. I guess my point is that if you just want to ride it, you can pretty much unfrenchify almost everything. Mine is a fixed gear and only a main triangle 531, I recently alligned the frame and fork. It is a beater so I couldn't care less about all the mods.