Bottom of receiver in front of trigger
No way to answer without the serial number.
Please check the link for the Manufacture Date codes details on the Remington Society of America.
I have a mod 700 bought in 1970 with a 7 digit number starting with 630 if this helps!
probably in the mod to late 70's but checking the barrel date code stamp is the best ;) See related links for information on the Remington Society of America.
by the serial number........................
Your serial number indicates that your Marlin mod 60 rifle was made in the year 1978.
No where I'm aware of online, I have a list ;) If it's made 1921 or later it's barrel code dated link added for details.
1916
Best left to a qualified gunsmith
No such model number.
1976
No way to answer without the serial number.