DT, that's a very typical French boxlock. Single (normal) St. Etienne proof. Fanget made a lot of barrels; have seen that name frequently on French guns. My guess would be that it's a St. Etienne gun, made for M. Chevillard's gun shop in Auxerre. Whether Chevillard did anything at all to the gun, other than sell it, is questionable. Maybe stock it and finish it . . . that "ARQB" is an abbreviation for arquebusier, or gunmaker--but I think it was also used by a lot of gun dealers/gunsmiths who really weren't makers at all.
And DT, you'll be happy to know your gun has barrels that won't explode. Says so right on them.
Robert, I've never seen a Verney-Carron sliding breech gun. All the side by sides they advertise currently are made elsewhere. Wonder if perhaps they had someone else make Darne-type guns for them at some point?
