You look it up in a book of published sn's or go to the maker's website or call them. Most will tell you over the phone.
Impossible to tell with just the serial number.
can you tell the age of a model 37a 20 gage Winchester by looking at the serial number
Yes
By the serial number.
By the serial number.
Serial number and features
Unfortunately I can't tell you the age by the serial number. State the model number, that will help identify it's age.
need serial number to tell the age
By the serial number.
By the serial number.
By the serial number and features
yes