70-100 yrs old; 50-100 USD
If it is a double, remove barrel and you will see it along with serial #.
thomas jackson of london england
nitro hunter shotgun single barrel with exposed hammer stamped belknap hdwre and mfg serial 5516
No, it is British.
Can't be answered as asked
about $3500
There should be a stamped model number on the left side of your barrel. The serial number will be on the reciever; however, the model number is on the barrel.
as your looking down the gun, the gauge should be stamped on the left barrel back by the stock.
The model will be stamped on the barrel right after the Winchester name.
Made in 1934.
Generally it is stamped on the side or top of the barrel near the receiver.
Blue Book of Gun Values will help.