As you may know, the gun is a "Trade Brand Name" shotgun which is an inexpensive but well made utility grade shotgun made by a major maker (and before 1940) and usually on contract to and for a wholesale sporting goods dealer, a retail chain store or and independent seller (Jones Hardware Store) who chose the name to go on the gun. Guns with the name OHIO ARMS CO were made by the W.H. Davenport Arms Company of Norwich, Ct (1878 to 1910). Sorry but I have no information as to who the seller was. I'm going to assume that the gun is a single barrel single shot break open breech loader. A standard feature of a single barrelDavenport shotgun is that they have a removable screw hinge pin. This pin goes in from right to left and must be removed to remove the barrel from the frame. It will have either a protrusion like key to assist in unscrewing the pin or it will have a flat flush tab that unfolds and raises up to unscrew the pin. On most guns with the flat flush tab, the tab is broken off and missing. I would say that seventy years ago you paid a fair price for the gun. Its current value will depend on its condition, the amount of original finish remaining on the metal and wood as well as the mechanical condition. A prime condition example (rare to very rare) that appears to have come out of the factory yesterday afternoon might bring as much as $125 at an auction while a rusty metal, rotten, missing or broken wood and missing parts piece of junk fit only for parts salvage or as a canoe paddle might bring as little as $10. The gun shop is going to tell you you have a piece of junk not fit to be fired and too expensive to restore and he will be right on both counts. Sorry but I have no serial number-year made tables for Davenport made guns but the the type of screw in hinge pin can determine the date of manufacture to about a twenty year period. Any more?