Possibly William Spinks Riley of The Eagle Gun Works, Vauxhall Street, Birmingham. Seems to have been a prolific inventor during the hammer gun era. Here are three snippets I found in The British Shotgun, 1850-1870. Oh, the number 122 is probably the use number.

If you could post good closeup photos of the action and barrel lugs it would help.








John McCain is my war hero.