My father just passed and left me a BELKNAP B63B single barrel shotgun. His "snake gun" he called it. It has a rabbit stamped on the right side, 12GA 3" Louisville, KY and a 42R in a circle stamped on it on the left. Was wondering if someone could tell me about it and date it. Also looking for an original barrel, as he shortened this one. I would like to put it back as close to "new" for my grandson to use one day. Thanks for any help.