The freewheel is 6-speed but the dropout spacing is only 120mm. And these are definitely the original French wheels. On all my other vintage bikes, 6-speed goes with 126mm spacing. Was there a close spaced 6-speed freewheel in this era?
Suntour? Suntour Ultra was a 6 speed freewheel the width of normal 5 speed. It can be made to index.
https://www.sheldonbrown.com/suntour-freewheel.html