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@Oiloncanvas
Thanks for all the replies. It seems that the French style braze on tab was used for a few years in the mid-80s as an alternative to the Italian style brazed hanger, so there are a few simplex and mavic front derailleurs that should fit. I'll try to track one down
I also had concerns about the derailleur pivoting around the point where it meets the frame, but maybe it's not an issue in practice. If I get one i'll let you know!
It seems strange for an italian-made (columbus sp/sl) 80's frame to have adopted the french system, I can only think that it must have been made for a specific mavic/simplex groupset