The letter R prefix dates your Marlin model 336RC(regular carbine) to the time frame of 1957-1958.I have the exact same caliber Marlin 336rc which was made in 1950,and would never sell mine.I love it and it shoots like a dream.
Your marlin model 336 RC(regular carbine) was made by the marlin firearms company in 1948 with the E prefix to the serial number that you provided.
The first letter in your serial number is the key to finding it's age. You can google marlin dates and find a chart with the years.
Your marlin 336sc(standard carbine) was made by the marlin firearms company in 1950.
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.
1980
Somewhere on the frame.
1975.
Many .22 caliber rifles made before 1968 did not have serial numbers. This would include your Marlin 100.
This Marlin 39A Mountie .22 Caliber Lever-action rifle with serial number R5077 was manufactured between 1957-1958.
1955 1955
There must be more to that number? Is there a prefix letter in front of the number? Are you sure about that caliber? ".30-30 special" Do you mean .30-30, or .32 Special? Is there a rollstamp on the barrel, and what does it read? Check behind the hammer also, for a model designation. If there is a sight there, you will have to remove the two mounting screws to see it. marlinguy@juno.com