As others have pointed out, without the original fork we simply won’t be able to determine which model it is. Here’s my TDF for comparison. In another thread Verktyg has officially declared mine to be a 1972. Campagnolo dropouts both front and rear, window cutouts on the brake bridge just like the Super Corsas shown above, long point lugs, fish mouth stay ends and swaged stay caps. Yet mine is not an SC because it won’t accept a Campagnolo headset. That’s the only consistent difference in the frame between the two models. In this era Gitane would seemingly do anything at all to fill a TDF customer order quickly. Seat post size is 26.4.
That’s a cool frame you found! There are a couple of appropriate Gitane forks available on eBay right now, couldn’t tell ya if they’re your size or what headset stack height they’ll accommodate.