It was made in 1973
The serial number indicates your gun was manufactured in 1966.
The serial number indicates your gun was manufactured in 1949.
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.
The serial number indicates Ithaca manufactured your Model 37 in 1956.
1950
(1949) - 202951 thru 302500
The serial number indicates your Model 37 was manufactured in late 1969.
There's a list of serial numbers by year at http://ithacagunrepair.com/page5/page23/
1926. sales@countrygunsmith.net
1975
There is only one serial number per firearm. Yours is post 1953. Call Ithaca and they should be able to tell you == ==
Manufactured in 1898