That's a Savage or Stevens model number, but it won't tell us the gauge. Any firearms dealer should be able to tell you the gauge by looking at the gun (unless it is a really unusual size) but a gunsmith can measaure the chambers and also tell you the length of shells it is supposed to use.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
1896
27p
Exactly how is the shotgun marked (all markings), and double-check the serial number. sales@countrygunsmith.net
about 200.00
1900
If it is a double, remove barrel and you will see it along with serial #.
it is worth about 400 dollars
Around July of 1925
Impossible to answer without more information.
That is impossible to determine without knowing the manufacturer and model of the shotgun.
You may have to break the shotgun down in to the barrel section and the receiver section first.Look under the barrel section on the flat just ahead of the lug for the serial number.