1896
Check the barrel and receiver.
Check the frame and barrel.
how much does it cost a 1983 marlin 38-55 hex barrel?
Your marlin 336sc(standard carbine) was made by the marlin firearms company in 1950.
Look on the barrel and receiver.
Impossible to know the caliber with only a serial number. It should be marked on the barrel.
The J prefix to your serial number indicates that your marlin model 39A was made in 1952.
Early firearms in .22 caliber were not required to have a serial number. Your Marlin 81 falls into this time frame.
85 years
1980
1975.
Somewhere on the frame.