The lock is of a style sold in quantity and fairly cheap 'Hardware store' maybe stamped Ashmore warranted. The wood is fairly standard stuff for what I've seen from up north, and the barrel is probably American made, and the whole gun seems to be a working man's gun a couple of notches above a 'shimmel' or a barn gun. Not being an expert by any means, IMHO I would put this piece late in the scheme of things, and it could date from 1800 to the Civil War. In spite of the brass furniture and curly maple stock, it is a plain piece, and would have been a late Pennsylvania style with almost Bedford county lines. Hopefully some vastly more experienced opinions will be shared to further enlighten us