I believe that Gary is correct in that it appears to be a Sheetz rifle from Hampshire Co, Virginia (now West Virginia). It has many of the tell-tale markings of a Sheetz rifle--double incised lines the length of the forestock, double engraved lines along both sides of the patchbox lid, similar if not exact patch box engraving as found on other Sheetz rifles. Not an expert by any means, but have seen several original Sheetz rifles.