Fox Collectors

Thank you very much for your help. Do you have and ideas on a value range assuming average condition?

My Father and I have a shotgn that we would like to learn more about. Top of right barrel reads "sterlingworth fluid compressed steel". Top left barrel " made by a.h. Fox gun co Philadelphia, PA. U.S.A.". Right and left side of gun says "stfalingworth". Serial on trigge...