Probably stocked here using mostly Euro parts. The lock is far older than the rest of the gun, say 1700-ish? and maybe Dutch/Belgian/French and originally flint. The trigger guard appears to be a highly modified german piece. The butt plate looks like it is made from sheet brass and possibly came from some sort of fowling piece. The barrel tang has been extensively modified, why I don't know. The barrel looks to be tapered and large bored, not something commonly seen on American rifles....looks like an old jeager barrel that has been cut off and had a rib attached. I hope you're real good at fixing wood, that's a pretty awful break. I certainly wouldn't be anxious to shoot that one.
The Barrel is 33 1/2 inches long, with stock its a total of 48 1/2 inches long, the stock is 2" at its widest point at lock mounting. Barrel is 1 5/8" at the breech, 1 1/8" at the muzzle. after some more light cleaning on the barrel, did find what looked like two grooves for the style of ramrod mounts under the barrel rib. Does show evidence of being in use a lot, from normal cap burn at where the nipple would be?
And as much as I would love to shoot her the idea of her being a shooter is still low on the list, Just bringing her back as a beautiful conversation piece is more likely then it becoming junk in a box and then lost.
FALouts noted concern of the notch for the lock bolt being deep was a concern of mine as well. Even with the notch, the barrel thickness at that point is just under a half-inch in thickness.
And day four of owning her and still not proof marks or makers marks found anywhere.