That's a very nice gun. That hogback stock is about as German as German gets. I'd bet in that caliber it'd make a nice, effective boar-stopper.
I bet that there is a JB on the barrels/action.
Jules Bury did most everything for Christophe.
Mahillon on the other hand mostly sourced from Francotte.
Nice find!
WC-
Going a little OT, if you have an image of a Jules Bury "JB" stamp, could you put it up for reference? My French guild 16 has the barrels stamped with "JB" (in addition to St. Etienne proofs) and both I and everyone else who've handled it have always concluded that meant the gun was barreled by Jean Breuil. I'd like to make sure....
And thanks.