I could be wrong but this looks to be a full Reynolds 531 frame. I just can't read enough of that downtube sticker but that looks like a full 531 sticker. Plus the bike has campy drop outs and AFAIK that means that this is a top end Gitane. Plus those campy parts are original right? Are those Mafac tiger brakes? I can't make out the name on them.

One thing that seems odd to me are the pump braze ons. In the bikes I've seen from this era, the top end bikes have few if any braze ons. It's when you went down the food chain so to speak, you'd start to see some braze ons.