Casey,

I believe the G.F. is a touch mark. If I am mistaken, I am sure some one will tell me. Could be the gun maker or the barrel maker. There have been books written about the touch mark (punch) of Belgian guns, but very little about French marks that I am aware of.

You might want to check here.
http://www.gournetusa.com/forum/

Geoffroy is attempting to build a knowledge base of these marks. He may be able to help, if he does not check in here.

The only other online resource is Littlegun, as Alain maintains a section on French guns.
http://www.littlegun.be/arme%20francaise/a%20accueil%20arme%20francaise%20gb.htm

As to your gun, I leave that to more knowledgeable here.

Pete

http://www.damascus-barrels.com/Movie.html