If 1970s I would have expected 120-22mm Suntour made ultra narrow chains and 6 speed blocks to go in the 5 speed spacing. The 80's saw 126mm as 6 and 7 speed became more common. French frames started to use "normal" standards in the 80's so no more French b/b thread, headset thread or 22mm steerer.
 
I might look out for a pair of them just because they look so nice....
Just been on eBay no Mafac but I guess they could be pricey.
 
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