Your serial number indicates that your Glenfield model 60 was made in the year 1974.
Your serial number indicates that your Glenfield model 20 bolt action was made in the year 1980.
With the serial number that you have provided,your Glenfield model 30A was made in the year 1977.
This question cannot be answered without you providing the serial number to you Glenfield model 60 .22cal semi-auto rifle.
Double check your serial number. sales@countrygunsmith.net
Your serial number indicates that your Marlin model 60 was made in the year 1971.
your glenfield was made in 1968.
1975.
1975.
1971
1970
The Glenfield model 25 wasn't a Marlin, so determining what it actually is is not easy. Obtain a copy of Modern Gun Values and try and determine the actual manufacturer. A Glenfield version is typically worth 75% of the manufacturer's value.