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.
500K sold between 61 and 78
The double is the last model NID (New Ithaca Double) mfg by Ithaca. This one was mfg in 1927. Depending on condition and gauge you may have a very desirable shotgun.
The same year you shot your gradma you freak
your 1911 was made by Ithaca in 1943
Call Ithaca at 1 877 648 4222 and they will tell you.
The Model 37 was mfg in 1969.
1963
1970
1957
1972
Ithaca Model 49, made c.1968-1970 or so. Value ranges from $50-$125. sales@countrygunsmith.net