Looks early to mid-1960s to me as well especially with pump pegs; however, the seat stay finish at top of stays does not look completely like Gitane (or MICMO’s pre-1966 sibling to Gitane, Geminiani) to me…can we get more photos of this key area? It may be just the angle, a little profile of seat stay top would be good

During the early to mid-1960s, MICMO used two seat stay finishes, on frames a step below the top, a diamond shaped cut and crimped swedged finish is used:




On high end frames, the top of seat stay is fitted with a “s” shaped cap inset into a diagonal cut in the stay, you can see the cut and crimped finish is designed to emulate the higher end cap (and the “s” shape shows up clearly in this photo):



Your frame has an inset cap but it looks to be a convex arc, more akin to a later willow leaf cap as found on top end Gitanes of circa 1968 to 1970 (but your bike looks earlier and does not appear to have this type either as on willow leaf you can run your fingernail under edge of cap around its entire circumference … also, no pump pegs):



Again, it might just be the angle. Better photos would allow for better answering you questions (or letting you know it ain’t a MICMO frame).