1136
serial number needed to find date made................
If that's the complete serial number, it was made in 1894. Nice find!
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.
Usually by the serial number. If no serial number, then by features
usually the serial number has a code which identifies the year made.
The closest I can find to that serial number would be a Colt peacemaker model .22 made about 1975.
Colt frontier scout with that serial number was made in 1962 per proofhouse.com
To find the year that any Winchester gun was made, you just need to know which model it is and what the serial number is (the model number and serial number are stamped on the gun itself). . Then go to this website and it will tell you when it was made: http://oldguns.net/sn_php/winmods.htm
The Colt commander with that serial number was made in 1955.
Your shotgun was made in 1947 with the serial number you provided.
serial number 28402
Impossible to answer without knowing who made it. Even then, if data has not been published you will not find out.