1973, these 336's can range in value from as little as $125, to about $325, depending on condition.
The value of a .22 caliber bolt action Marlin Model 20 rifle with a serial number 71377074 is between $100 and $400. The actual value varies greatly based on its overall condition and the potential buyer.
1950.
1949
1988.
Your Marlin model 15YN little buckaroo single shot,which was made in the year 1994 will bring between 80-110 dollars in the condition that you describe.
Early firearms in .22 caliber were not required to have a serial number. Your Marlin 81 falls into this time frame.
Many .22 caliber rifles made before 1968 did not have serial numbers. This would include your Marlin 100.
1952.
Your marlin 336sc(standard carbine) was made by the marlin firearms company in 1950.
The caliber should be marked on the barrel near the receiver. The Model 39 is a 22LR
S=1958-59.
1980