That's a very nice rifle, in really good condition!
It is similar in many respects to the "trade rifles" that were distributed to native tribesmen in North America during the percussion era, although it might have just as easily been carried by a white hunter in the Ohio country, near where it was made.
Whoever owned it must have appreciated its value, as it appears to have been well cared for.
If you don't mind, some measurements would be of value to a lot of us. Caliber, barrel length and diameter, total weight...