I think i found it in my gun book French smooth-bore Flint-lock musket, cal. .75 engraved on the lock in script Charleville ? i cant make out the letter in my book. Iron-mounted; wide iron bands. Gun photo in my book, formerly owned by Elisha Crosby, Ashburnham, Mass., and carried in the Revolutionary War. WOW is all i can say. I will upload that name and a photo of the gun. The gun photo in my book is small but it sure matches your flint lock. Hope this helps. Forgot to mention that photo has a bayonet turned around and in the barrel lol.