Call Ithaca at 1 877 648 4222 and they will tell you.
You would need to include the model number or name of your Ithaca firearm,along with the serial number to get the correct answer.
You can tell how old your Ithaca gun is by the model and serial number
Your serial number indicates that you have a Ithaca crass model double,that was made in 1903.
Made in 1969. Info from Ithaca Gun Co. serial number check chart.
The serial number indicates Ithaca manufactured your Model 37 in 1956.
It sounds as if you have a Ithaca Crass model shotgun,that was produced in the year 1903 by your serial number.
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 1966.