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Stamped on barrel, Barrel and reciever one piece.
Usually caliber and/or serial numbers.
Made in Belgium.
If it is a double, remove barrel and you will see it along with serial #.
nitro hunter shotgun single barrel with exposed hammer stamped belknap hdwre and mfg serial 5516
remove barrel and serial # will be stamped on top of receiver on left
1924 - it will be date code stamped on the barrel.
Forget the serial, check the date code stamped on the barrel. See related links.
Don't have 121 serial list, check date code stamped on barrel. See related links.
A 410 gauge, single barrel shotgun with Volunteer stamped on it and Serial number A981277 was made by the Volunteer Arms Company. They made guns for Belknap Hardware store in Louisville, Kentucky.
The primary serial # is stamped on the barrel of the gun opposite the cartrige ejection port
Forget the serial, check the date code stamped on the barrel. See related links.