This vintage bicycle has challenged my research abilities. I purchased it recently on eBay and had this basic info from the seller: a post WWII Oscar Egg lugged mixte, no marquis, but probably French built, with top of the line components, including tubular Clement rims laced to F. B. hubs – plus a number of other interesting components that were new to me.
Immediately, I began to wonder about when this bike was made and why there is no marquis or headbadge to indicate the builder. But, I’ll put aside that weighty question, and present these photos taken before disassembly:

An ornate pump peg, plus evidence of a front impact. The tubes appear straight and undamaged, however.

A 4 speed Simplex Tour de France rear derailleur mounted on the model-specific and quite robust Simplex dropout. A real contrast to the delicate downtubes and chainstays.
I am looking forward to having the time to undertake this fascinating restoration project! I have been involved with restoring a number of late ’40s bicycles. This one, I think, will add some depth to my knowledge base.