I'm looking for some info on a double barrel shotgun for a friend. The only identification I can find on it is the left side under the hammer it is stamped "J. Stephens Arms and Tools Co. Chicopee Mass U.S.A" I can't find any type of a serial number on the barrel. Anyone have an exact place to look? It looks like a 16 gauge but I'm not 100% on that. It has dual triggers and looks to be about 75 years old.