Depends on model and when it was made. I have a Stevens 84-C that has no SN on it.
SN not required before 1968
with a serial number of E261611
Check the barrel and receiver. Sn's were not required before 1968
Serial numbers were not required before 1968. If it has one, check under the forearm, on the barrel and on the action.
Where is serial number on stevens 311c 410?
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.
The letter on the serial number usually indicates the date it was made. The letter "S" on your serial number indicates that it was made on 1965.
model 77 does not have a serial number,they were made before serial numbers were required
The stevens model 9478 shotgun was made between 1978-1985.
If it was manufactured before 1968 it probably doesn't have one.