I recently aquired an old single shot hammer shotgun and am looking for identification and possible value. It has few markings for any identification. The one piece receiver is marked Worlds Challenge Ejector. The barrel is marked genuine twist on top and choke bored on the side and bears the number 9242 on the barrel lug and forearm metal piece. Barrel is 29 7/8" including chamber. Chamber measures 0.745" at breach. Choke measures 0.660" at muzzle. It appears to be 16ga although the shell seems rather loose in the chamber. Chamber depth appears to be about 2.920" as near as I can measure to apparent forcing cone. Bore is good with some slight rust/pitting. Action is tight and fully functional. Wood shows some damage and repair of stock area. Overall condition would be grade fair in my opinion.