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@Rik_Van_Looy
Definitely french - 35x1 is a french BB thread, Simplex are a french company and their dropouts were not very common outside of france.
Would be interesting to see if the fork threads are also french (22.0 not 25.4mm).
The best clues on the age of the frame are the presence of bottle bosses on the downtube and braze-on cable mounts on the TT, and shifter mounts on the downtube. Bottle bosses emerged in the mid to late 70's, ditto downtube shifters. The French were early adopters of such innovation.
do a flickr search for french bikes like Follis, Motobecane, Mercier, Gitane etc and see if you can find any lug matches - those look a bit like prugnat....