The add says :
Everything is this guitar is original. Stamped inside "Henri SELMER PARIS Ref. 543". Sold with OHSC and 2 tortoise picks.
This guitar became famous b/c of Django who played them.
This guitar belonged to my father in law who bought it in the 1945s and played with orchestras at the time.
http://www.leboncoin.fr/instruments_de_ ... htm?ca=4_s
Number seems about right for a guitar from around 1942.
I've never seems a Selmer with maple back ?
To me it looks like an old Patenotte.... The dovetail doesn't looks right as well.