Super Corsa would be my guess as well, but Gitane was noted for using what was on hand to build bikes on any given day, rather than what the spec sheet said.
In any case, the 531 Gitanes really are something special. My Super Corsa is the one bike I would keep if restricted to one.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)