I have a few random thots: the pentagon shaped stop was intended for a clamp with a flat bottom edge (like Simplex) and the Campy is a later addition made by the owner. Therefore (a leap in reasoning) ALL the Campy gear is add-on upgrade and the Simplex DO was tapped, after manufacture. Is the Italian stem a FR diameter, or sanded to fit? My TdF had unique "leaf" plate caps on the seatstays, but most TdF's I've seen don't. Is this seatstay end treatment shown EXACTLY like your Tdf, Dirtdrop? (the scalloped ends of the stays on the DO do look very like my Gitane, however) I just saw pix of another French bike (a ROYAL, neverheardofit) that has the same "ugly" rear brake cable stop arch, so this piece is NOT a Gitane-only feature, tho that's where I saw it first and most. Lastly, if this guy was of a mind to buy a bunch of Campy parts to adorn it, maybe he splurged on a chrome plating job, aftermarket, too. Wouldn't be the first time that was done.