manufactured 1970
your serial number indicates that your Glenfield rifle was made in the year 1977.
With the serial number that you have supplied,your Glenfield rifle was made in the year 1973.
With the serial number that you have provided,your Glenfield model 60 rifle was made in the year 1976.
With the serial number that you supplied,your Glenfield model 60 rifle was made in the year 1978.
By the first two digits of the serial number. AB
1974.
With the serial number that you have supplied,your Marlin(Glenfield) rifle was made in the year 1980.
Yes.
Your serial number dates your rifle to the year 1982.
I would check the lower tang,under the lever.
It may not have one. Serial numbers were not required by law on rifles and shotguns until 1968.
This question cannot be answered without you providing the serial number to you Glenfield model 60 .22cal semi-auto rifle.