What is the history of an old double barrel 12 gauge shotgun?

Answer 1

If there are no other marks, it will be pretty difficult to identify the maker or exact age of your shotgun. I can say it was definitely made after the 1914 patent date, so it is considered a modern gun by collectors. I can also guarantee you that it was not used in any war. There haven't been any double barrel shotguns used by any army since the US Civil War, and only a few then. Unless it has fancy engraving, carving, or silver-plated parts, it's neither rare nor valuable, but as your grandfather's gun it should be priceless to you and your cousins.

I have know nothing about J.N. Scott, but there is another thread on this page that has some information.