The Ithaca 45 m1911a1 serial number NO 860361 pistol was made by Ithaca in 1943
Your serial number indicates that your Ithaca shotgun was made in the year 1920.
Your serial number indicates that you have a Ithaca crass model double,that was made in 1903.
A model 37 with the serial # 10464 was produced in 1939.
The serial number indicates your gun was made in 1955.
Call Ithaca at 1 877 648 4222 and they will tell you.
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.
It was made in 1919.
612
Made in 1949
about 1925
The Ithaca Model 37R with serial number 505739-4 was manufactured in 1970. The serial numbers for Ithaca shotguns can help determine their production year, and the range corresponding to this serial number indicates its date of manufacture.