Fjestads "Blue Book of Gun Values", available at most large book stores, includes a serial number by build date for most American made guns.
your A H fox Sterlingworth shogun should be marked as far as the gauge is concerned.I would look on the barrels or on the receiver after you take the barrels off.As far as the age of your shotgun is concerned,that can be determined if you supply the serial number of your shotgun.
Blue Book of Gun Values
Your Serial number indicates that your Fox Sterlingworth shotgun was made in the year 1919.It was one of the first 268 shotguns made that year out of a total production of 800 for the year 1919.I hope that you find this informative.
That is a hamerless side by side 12ga made by AH Fox Gun Co in Philadelphia. Yours is from 1926.
It appears your shotgun was made in 1926. As far as the value it depends on the length of the barrels, the overall condition, and any options like engraving. Generally these sell for $500 up to $1500.
I appreciate any information you can provide as this was my great grandfather"'s shotgun?
273.2310
Remington
If you can find one, yes.
Obviously French, but not much else. The proofmarks under the barrel and type of action will help date the shotgun.
Your question cannot be answered without you providing the name of the maker of your shotgun,and then we can determine if there is any public data to identify the year of manufacture.
You find a gunsmith.