Hi again,
I'm not sure i agree on the Belgium marks.There is a b with a small crown over it on the lock.I have never personally seen the nelson's column on a gun.just drawings of proofs.So i'm not qualified to say.Just my opinion.
In my opinion it more resembles a 1763 charleville.The proofs,lack of spring on the middle barrel band and the different hammer shape,make me wonder.
The US mark on the lock does appear on some charleville's.Washington passed a resolution to stamp french arms imported during the war with US.
The trigger guard looks french to me.
On the bottom of the stock is a J S or US over a_ _ ursuin The _ _ is where the js is.That could be a stamp for maryland as it was kept there for a while?Also on the stock is a roman numera V and the capital letters IN.
These are the things that puzzle me.That why i say it might be a mish mash of parts cannibalized from guns and parts when washington showed up near boston in 1775 and found guy's without guns.They started raiding for weapons(i belive).
I'm no expert.
I'm not sold on the belgium thing.Hoping for more in put.Thanks