No way to answer.
By the serial #
It sounds as if you have a Ithaca Crass model shotgun,that was produced in the year 1903 by your serial number.
It was made in 1919.
5 years
1896
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.
Around July of 1925
Need to know model
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.
Made in 1949
Made in 1968
By your description,it sounds as if you have a Ithaca model Flues double barrel shotgun that with that serial number was produced in the year 1914.