They were produced from 1940-1945.
All my records indicate that stevens did not make a model 337 shotgun.If your stevens shotgun is marked U337 under the receiver,this would be a serial number,not a model number.
Your Stevens model 240 was made from 1940-1945.
The Stevens Model 520 was built on a Browning patent and so marked. Stevens also built the gun for Sears before World War II under the 'Ranger' tradename, so if you have a slide-action shotgun marked 'Ranger' and 'Browning Patent' then that is what you have.
Under $100. sales@countrygunsmith.net
A Stevens Arms Model 287 is a Semi-Automatic .22 Cal Rifle. Ammo is fed thru a tube that under the barrel.
I just bought a Stevens Model 512 Gold wing 12 Ga. at Cabela's for $599.00
If it was manufactured after Dec 31, 1968, the serial number will be plainly marked on the receiver. There will be some numbers under the barrels, but they may serial numbers or just batch/lot numbers that will not help identify the date of manufacture. Serial numbers were not required on long arms in the US until 1969.
Stevens Model 9478 shotguns generall sell under $100. sales@countrygunsmith.net
Stevens is a sub division of the Savage arms Company.That is were I would start my search.The Savage model 24 is the model number.
1997
The Sears model 100.101 shotgun was manufactured by the Stevens Arms Company. Stevens was known for producing a variety of firearms, including shotguns, under various brand names for retailers like Sears. The model 100.101 is essentially a rebadged version of the Stevens 311 shotgun.
If it's marked Springfield and not Stevens, probably circa WWII or so (though they weren't used by troops in the war, that roughly coincides with when they were sold to sportsmen under the Springfield brand name).