1974 Determining the year after 1972 is the first 2 numbers of the serial number from 100. ie: 100 - 26 = 74 therefore year of manufacture is 1974
1974 regards russ
No sn data published.
Your Glenfield Model 25 is actually a Marlin Model 80 with sling swivels. According to leverguns.com Forums all of the Glenfield rifles were numbered right along with the Marlines. According to http://armscollectors.com/sn/marlinlookup.php your rifle was manufactured in 1973.
Brophy's book on Marlin History has sn information.
1997
No published sn data. The History of Marlin by Brophy might help.
Based off of the sn you posted 1966. http://armscollectors.com/sn/marlinlookup.php
http://armscollectors.com/sn/marlinlookup.php
Made since 1960. Unaware of any published sn data.
armscollectors.com/sn/marlinlookup.phphttp://www.savage99.com/marlin336_dates.htm
Your Glenfield was made in the year 1974.
Take 2000 the first 2 digits of the SN. 1986.