I have a Stevens shotgun that has been handed down marked "J Stevens & CC Chiocopee Falls Mass Pat Sept 6 1884" It is a single barrel 12 ga tip up model with an extractor. Serial # 622x. The serial # is on the barrel, and trigger guard. I do not see it on the reciever, but the barrel is screwed in (at the pivot) and I don't want to mess with it. It is in very good shape. Can anyone tell me anything about it?