If the company has a website, they might have sn data.
Blue Book of Gun Values, Jan C. Still's website.
You can find out what year your gun was made by having an expert appraise the gun. You can also find out by finding the model number and contacting the manufacturer.
Website for gunpartscorp.
Gun shop, gun show, gunpartscorp website.
The Top gun video website offers many special features based on the movie Top Gun. On this website, individuals can find trailers, games, merchandise, and movie reviews regarding Top Gun.
Most guns actually have their maker on the gun itself. Check the side of the gun.
Contact the maker.
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
Gun Broker
Gun shop, gun show, gunpartscorp website.
Proofhouse.com has sn data.