from 1968- 1973 the year is the first two digits in the serial from after 1973 subtract the first two digits from 100 (ex 2011645 - 100-20=80). before 1968 there are no serial # on .22 cal firearms.
Your Glenfield model 25 was made in the year 1978.
Your Glenfield model 25 was made in the year 1988.
Your serial number indicates that your Glenfield model 25 was made in the year 1976.
your marlin/glenfield was made in 1974.
Your serial number dates your Glenfield model 25 to the year 1977.
1979.
1974
With the serial number that you have supplied,your Glenfield rifle was made in the year 1973.
Your Glenfield model 25 was made in the year 1973.This is accomplished by subtracting the first 2 digits of your serial number from 100.Hence 100-27=73(1973).
ammoclip.com $18 plus shipping The Glenfield model 25 was made by Marlin as the model 80
Your serial number indicates that your Marlin model 25 was made in the year 1973.
No published sn data. The History of Marlin by Brophy might help.