This Marlin 39A Mountie .22 Caliber Lever-action rifle with serial number R5077 was manufactured between 1957-1958.
Without a serial number provided,I can say that the Marlin model 1893 rifle was made between 1893-1936.
14069
Your marlin 336sc(standard carbine) was made by the marlin firearms company in 1950.
It looks to be manufactured in 1973 from the first two digits of the serial number cited. Their .22 caliber bolt action & semi-autos were not serial numbered prior to 1969.
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.
1975
Your Marlin rifle was made in the year 1975,with the serial number that you have provided.
1980
Somewhere on the frame.
1959.The R prefix to your serial number dates your Marlin model 39A to the years 1957-1958.