The gun was made by SKB in Japan and imported by Ithaca, starting in 1966. I don't know when your particular gun was made.
Your serial number indicates that your Ithaca shotgun was made in the year 1920.
The Ithaca 45 m1911a1 serial number NO 860361 pistol was made by Ithaca in 1943
You would need to include the model number or name of your Ithaca firearm,along with the serial number to get the correct answer.
A model 37 with the serial # 10464 was produced in 1939.
Your serial number indicates that you have a Ithaca crass model double,that was made in 1903.
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.
Call Ithaca at 1 877 648 4222 and they will tell you.
I bought an Ithaca hawkin kit in the 70s. I finally got around to finishing it. There is no serial number on it anywhere
It sounds as if you have a Ithaca Crass model shotgun,that was produced in the year 1903 by your serial number.
You can tell how old your Ithaca gun is by the model and serial number
We can't tell from a serial number alone.
Both should date to 1954.