Almost, the stock has to be removed to locate the serial number. With the stock removed, hold the rifle so that you can read "+ Marlin No. 18 +" behind the hammer, then tilt the rifle 90 degrees and the serial number should be on the upper tang.
Your serial number indicates that your marlin rifle was made in the year 1992.
1975
Your serial number indicates that your Marlin rifle was made in the year 1972.
Yes.
move the trigger loop, it should be on the bottom tang.
1964
1988. 100-first two digits
1961 (August)-1962.
Most serial numbers on lever action guns are founr under the lever. I would check there. On all firearms manufactured in the US after 1968, a unique (for the model) identifying serial number must be on the receiver. You will not find a serial number on the barrel. Marlin serializes Model 336 rifles on the upper tang behind the hammer. Early Marlin rifles were serialized on the lower tang behind the trigger before 1968, but since that is a removable part it would not satisfy federal requirements under the Gun Control Act of 1968.
The 2 letters AD ahead of the serial number indicate that your Marlin model 336RC(regular Carbine) was made in the year 1968.
The serial number is located about 3 1/2 inches forward of the center of the trigger guard on the left side of the rifle.
Remove the trigger assembly. It should only be 3 screws. The serial number is located on the bottom of that plate. (At least it is on my model 99 m1)