The pentagon stop is typical Gitane. I don't see how it could be anything but a TdF if it is a Gitane. The model above it had Campy dropouts and the model below it was way below it. None of them had headbadges, to my knowlege. Maybe it's a model they didn't export. Maybe it's a one-off for a show or something.

I'm sitting here staring at my Gitane TdF, trying to figure out What the "ugly rear stay cable/bracket is that you referred to. Do you mean the derailer cable stop that's clamped to the chainstay?

It's very strange that they would build it with Simplex rear dropouts and a Campy derailer, since the dropout would have to be tapped and reshaped to give it a stop for the Campy derailer. Why not just use Campy dropouts like the Super Corsa? It's not strange that they mixed brands of dropouts. My TdF has Simplex in the rear and Campy in the front.