look at it. if it looks old then its old.
It would be almost impossible to identify a gun just by its serial number.
Library, appraisal, old gun catalogs
By maker information.
Basically impossible to identify with just the serial number.
Books, gun shows, gun shops, pawn shops.
No. You should take it to a gun dealer to help identify it.
Specific features and old catalogs
By model, caliber and serial number.
No. It's best to take it to a gun shop to help identify it.
Answers.com does not support images so there is no way to see or identify your air gun.
Library, gun shop, gun show, pawn shop
Gunsmiths, gun collectors, gun-oriented internet forums, you might find someone at the gun show who'll know something about it.