The same year you shot your gradma you freak
Your serial number indicates that your Ithaca shotgun was made in the year 1920.
Call Ithaca at 1 877 648 4222 and they will tell you.
1976
1975
Impossible to answer without the serial number
By the serial #
1924
1976 is the year
The Ithaca side by side 12 gauge serial 188650 was made in 1927.
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 need to provide the serial number.
This was apparently prior to the acquisition of Lefever by Ithaca, since it appears that the first Ithaca Lefever serial numbers contain 6 digits (Lefever Nitro Special - 1921)