The Model 37 was mfg in 1969.
Call Ithaca at 1 877 648 4222 and they will tell you.
By the serial #
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.
1970
1957
You would need to include the model number or name of your Ithaca firearm,along with the serial number to get the correct answer.
Made in 1977
1974
1989
Mfg 1975
The serial number indicates your Model 37 was manufactured in late 1969.
It was made in 1973