Your serial number indicates that you have a Ithaca crass model double,that was made in 1903.
i got a 12 gauge king nitro double barrel double triggers and double hammers no serial number on it
It sounds to me that you have a Ithaca Flues model double barrel shotgun.With the serial number that you provided,your shotgun was made by Ithaca in 1917.
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
With a serial number preceded with an "S" , I'm betting it was SKB of Japan
if this is the correct serial number ending in "560" it was manufactured in May of 1860.
there is no serial on it
Serial numbers are not unique between makers. Impossible to answer.
Serial numbers were not required before 1968. If it has one, check under the forearm, on the barrel and on the action.