Not thoughts, my friend, but fact. The reason we spent hundreds of hours putting together the 5 vols on OH long rifle makers and allied tradesmen was to show who made guns where at least in OH. The Oblinger family of Miami County [obviously Ohio] included: Charles; Charles M.; David, Jr.; John; John W.; Solomon; Walter; and Wilson. I have no idea if Sellers took these names and if so if he copied them correctly. Try vol III of Ohio Gunsmiths & Allied Tradesmen. They were both gunmakers/ gunsmiths and sporting goods dealers. The Johnson was most likely J. H. Johnston, the proprietor of the Great Western Gun Works. His barrel may have been recycled or he may have sold barrels. In this case, based on my photography of Oblinger family guns, I'd judge that 1 of them made this gun.