1976
Your serial number indicates that your Ithaca shotgun was made in the year 1920.
about 1925
1938-39
You vave an Ithaca sxs Flues model made in 1911
There's a list of serial numbers by year at http://ithacagunrepair.com/page5/page23/
1924
Impossible to answer without the serial number
A model 37 with the serial # 10464 was produced in 1939.
It sounds as if you have a Ithaca Crass model shotgun,that was produced in the year 1903 by your serial number.
Impossible to answer without the serial number
1905
With the serial number that you provided,your Ithaca double barrel shotgun with the damascus barrels was produced in the year 1900.