Joined
·
79 Posts
I'm just going to make this easy on everyone...this site has a serial number entry, so its automagical 
http://oldguns.net/sn_php/marlinlookup.php
it is NOT the JM in a circle...that's the proofmark.
http://oldguns.net/sn_php/marlinlookup.php
The code is on the barrel, usually just underneath the stock's forearm.All Marlins (except lever action) manufactured from 1962-1968
A two letter code was used to designate month and year of manufacture.
it is NOT the JM in a circle...that's the proofmark.