This looks like a late Salem Longrifle. There were three gunshops operating in Salem when this rifle was made. This includes Timothy Vogler, William Dettmar, and George Foltz. If the rifle is not signed on the barrel by the maker, it would not be possible to tell you which one made it.
If you want to learn more, go to the musem section at the bottom of the forums page, select Educational Research, N.C. Longrifle Schools, and #4 the Salem School. You can also purchase my book, The Longrifle Makers of Forsyth County and Davidson County if you wish.
I live in Greensboro and will have Salem Rifles on display and the books for sale at the Greensboro Gun Show at the Coliseum in two weeks. (Feb. 6 & 7th.) Bring the rifle to the show and I will see if I can tell you more about it.
Michael Briggs