Guy, This rifle is strongly related to the early Lexington style rifles made in central Kentucky by transplanted North Carolina gunsmiths. Several of us who study Kentucky-made guns think this rifle was most likely made by William Bryan, Sr. He was killed at/near Bryans Station about 1780, so it would make it an early piece. I doubt he made guns during the short time he was in KY, so probably it was made not too long before his departure to KY. Mel Hankla at one time thought it might by by son Daniel, and it could be, but that puts it somewhat later, since Daniel left Bryans Station about 1780 and didn't return for 5 or 6 years (don't quote me on the years, this is from memory). I'd like to think it's the work of William Bryan, Sr., but it might be an early KY piece by Daniel Bryan. Unfortunately, we have so few signed guns by either of them that we are hard pressed to make any more definitive attributions.
The lock is a fine looking replacement, hand built by Louie Parker years ago. I don't know if the original mortise had been opened up by a secondary lock, or how close to the original mortise the new lock is, but if Louie did it, it's probably pretty close to what was needed. Normally on Bryan rifles, the makers used somewhat smaller locks, frequently Ketlands of almost pistol size on their rifles. But with this earlier gun, I don't know what the original looked like. If any other work has been done on the gun, it's hard to tell. I have seen better pictures of it, and couldn't see any signs of repair. Regardless, it's an early rifle, and fascinating with its tall butt, Lexington style cheekpiece and Bryan style incised carving details under the cheek and in forestock molding. Triggers are also strongly in the Bryan/Lexington style. If I recall correctly, Louie said the guard is iron, despite looking like a cast brass guard. Shelby Gallien