Thank you for sending me the pics of the W Richards, Liverpool, Rich, it is the real thing and has been nicely restored. The barrel length is a bit suspect and if that in the original leather motor case, the barrels do not fill the compartment. However, you say they have some choke, but I'd like to see the muzzles.
Perhaps when you get the gun you can post a pic of the muzzles.
Regardless, I'd love to own that little W Richards and 20 bore hammer guns are uncommon, I'd buy it in a heartbeat.
Mike