Mike: I checked my 1902 Sears Roebuck & Co. catalog, and the breech balls on your gun are very similar to the "Diana Style Breech, Double Barrel Breech Loader...made in Europe by one of the oldest and most reliable makers there, and we offer it for the first time at the remarkably low price of $10.90"; no doubt Pieper. The same gun is offered in the 1909 catalog.