Library, gun shop, gun show, appraiser.
To find out how old a Winchester rifle is one would need to take the rifle to an appraiser or gun shop. The gun shop will be able to look up the gun by the serial number.
Check the phone book for local gun shops. They may be able to appraise, or refer you to an appraiser.
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.
Get a copy of Blue Book Of Gun Values. This year will be the 30th edition.Also find a professional appraiser.
Gun shop, gun show, pawn shop, Blue Book of Gun Values, appraiser.
Serial number of a firearm is only one factor, and probably not the most important factor. The condition of the gun is at least as important. You would need to have it inspected by an appraiser to know what it is worth.
You will have to find an appraiser who is familiar with them. Don't come up for sale often.
You need the services of a professional appraiser
www.MusicAppraisals.com
You will need to find an appraiser.
You can find a real estate appraiser school at the Appraiser License website. Once on the page, select the state you want to get your license in to bring up more information.