It sounds like a Flues model shotgun. If so, it was made in 1921. Check out the full list of serial numbers by year at http://ithacagunrepair.com/page5/page23/
Look in "The Ithaca Gun Company - From the Beginning"
1916-fluse model
about 1945
about 1917
made about 1943 by ITHACA firearms company
The Ithaca Hammer 12 with serial number 185709 was manufactured in 1911. Ithaca Gun Company produced these shotguns during the early 20th century, and the serial number helps pinpoint the manufacturing date. If you need more specific details or information, consulting Ithaca Gun Company records or a firearms expert may provide additional insights.
To decode the serial number of the Ithaca M 66 shotgun, you can refer to the year of manufacture based on the serial number range. Ithaca's serial numbers often indicate the production year; for example, M66 shotguns produced in the early 1970s may have serial numbers starting with specific prefixes. Additionally, you can consult resources like the Ithaca Gun Company’s records or reference books that detail serial number charts for more precise dating.
made in 1945
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.