CV6

Given that other Gitanes never show more than the most basic competence at metalwork it is hard to imagine where the factory would have found the employees who could do a fair copy of a master's work. In OP's photo 3 the stay plates form a graceful arch when viewed from behind. You can look at those Carré plates from any angle and they will show grace. Factory hands can't do that. The signature and documentation you are looking for is written in metal.