Your Model 1897 Shotgun was made in 1912. MOD refers to it being choked modified vs full, cylinder, skeet, etc..
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
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.
Made in 1934.
The model will be stamped on the barrel right after the Winchester name.
Generally it is stamped on the side or top of the barrel near the receiver.
Blue Book of Gun Values will help.
Remingtons are dated not by serial number but by a 2 or 3 LETTER code stamped on the barrel- left side, about a half inch from the receiver. The Remington Collectors Association website has the chart to interpret the letters.