The Marlin mod 60 was introduced in 1960 and yours may not have a serial number on it. Serials were not required on .22's prior to the 1968 Gun Control Act.
your marlin/glenfield was made in 1974.
With the serial number that you have supplied,your Marlin(Glenfield) rifle was made in the year 1980.
With the serial number that you have supplied,your Glenfield rifle was made in the year 1973.
Your serial number indicates that your Glenfield model 25 was made in the year 1976.
Your Glenfield model 60 was produced in 1989.
1979.
1975
1975
With the serial number that you supplied,your Glenfield model 60 rifle was made in the year 1978.
With the serial number that you have provided,your Glenfield model 60 rifle was made in the year 1976.
Your serial number indicates that your Marlin model 25 was made in the year 1973.
Your serial number indicates that your Glenfield model 20 bolt action was made in the year 1980.