Eric, I defer to your expertise on this one. You present some tantalizing options here. The style is early enough in my opinion that it could have been made prior to 1813. It follows the Ketland style generally and they go back into the last quarter of the 1700s.
With that name on it, it is hard to see it as an imported lock, as opposed to hardware dealers who had locks made in Europe and stamped with the company name.
Quite possible that 'Newhard' made the lock and that brings us to wonder if he also made the
rifle, too. It would be helpful to see and hold the gun for a critical examination.
Regards-Dick