Originally Posted by John E

What is the seat post diameter? I presume the seat tube's outer diameter is 28.0mm (French).

Perhaps Peugeot, but the decals remind me of Gitane or Bertin. It could also be some other marque made by Motobecane, Peugeot, or Gitane.

I have never seen a Peugeot of that vintage with Huret derailleurs -- they all came with Simplex.