Managed to contact F S Harrison ironmongers in South Wales today but sadly it was a dead end. They guy on the phone told me the firm had been in business for years but as far as he knew, they had never sold shotguns.
Always worth a try though eh. I'd guess there may be an American connection as the only other Harrison that came up on the Internet was a wall hanger in an auction over there a few years ago. It looked identical to yours so maybe a Birmingham gun sold through a dealer in the states ?
