Re: jon hill
Appears to be english with a bore of .710
The the Jo Hill would probably be the maker but could have been made anywhere as the barrels were often exported and the gun completed by the smith else where.
Lots of this history around that no one will ever know the complete story on.
A good number of guns made in early America were made by the village blacksmith perhaps Jo Hill was one
NRA GOA CCRKBA
Happiness is a warm barrel