You find a book with serial number information and look it up. You find a book with serial number information and look it up.
You find a published list of serial numbers for the maker.
The Blue Book of Gun Values or online at oldguns.net
Proofhouse.com has sn tables you can look it up on.
No way to tell. You can look up that patent, and it will tell you what year that patent was granted- but there is no way of telling when it was made, other than AFTER that patent was granted.
Look up the serial number.
Try Proofhouse.com
Just look up videos on youtube on how to modify your nerf gun.
The year of manufactor for this gun is 1951. You can look up the serial number here http://armscollectors.com/sn/winlookup.php and it will give you that information
Use the link provided to Browning's site to look up your gun.
Find a copy of the company history written by Brophy and look up the sn.
If that is a US Patent, you can look it up on Google, and tell when the patent was issued, but it cannot date the gun- other than we know it would have been made AFTER the patent was issued.
Not unless with adult supervision or without people witnessing he has a look alike gun