Want this question answered?
Call the maker or find books published about the maker.
Contact the maker or find a book on the maker.
Find books on the maker.
Library, book store, gun shop, gun shows. oldguns.net
call the maker.
by stalking him
You will have to call the maker to find out what it means.
Find a book with sn's from that 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.
Post the maker's name and serial number.
List the maker, caliber, type and serial number.
Find a source with sn data for that maker and look it up.