You will have to check with the US Patent Office
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.
Can't be answered.
call the maker.
by stalking him
Gunsmith, gun show, gun shop, pawn shop, or old catalogs of the maker
Find out who the maker of the gun is and see if they can help you with the model name and number. If this is an old gun and the maker is no longer in business check with a professional appraiser. The number by itself does not mean much.
You will have to provide the name of the maker.
Find books on the maker.
Contact the maker.
No
Post the maker's name and serial number.
No way to answer. Must have the name of the maker