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With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
Your Iver Johnson double barrel shotgun can be dated by the words hammer forged.This places production from 1936-1941.these were well made mass produced field grade shotguns of high quality.
1896
27p
Exactly how is the shotgun marked (all markings), and double-check the serial number. sales@countrygunsmith.net
Around July of 1925
1900
it is worth about 400 dollars
Impossible to answer without more information.
about 200.00
If it is a double, remove barrel and you will see it along with serial #.
That is impossible to determine without knowing the manufacturer and model of the shotgun.