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Early firearms in .22 caliber were not required to have a serial number. Your Marlin 81 falls into this time frame.
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.
Your marlin model 1893 was made by marlin firearms in 1894.
Your serial number indicates that your Marlin model 336 rifle was made in the year 1971.
Your marlin model 39A was made by the marlin firearms company in 1952.
d15025.You have a Marlin model 36 3rd Variation which was made between 1946-1947.
The Sears Model 42DL .22 caliber rifle was manufactured by Marlin Firearms, their Model 80. Check with Marlin for parts availability.
The serial number plus the book on Marlin Firearms History by Brophy.
1952.
Marlin Firearms Co.
Your marlin model 336RC(regular carbine) was made by marlin firearms company in 1968.
go to: Marlinfirearms.com and pose the question to them