I have an antique Remington Arm Co. Inc. model 10, 12 gauge pump shotgun made by Ilion Works in Ilion, New York. There are three patent dates stamped on the barrel, Feb 3, 1903; May 16,1905; and March 30, 1926. I was wondering when these were actually manufactured, and about how much they go for? It has an extra barrel with it, and the butt stock isn't original. It's a bottom ejecting shotgun and I think all you can shoot out of it is 2 and 3/4 inch shells.