The serial number will start with MR***** on the left side of the receiver if its a marlington
Marlin will have a "JM" proofstamp on barrel forward of receiver.
Remington made will have a "REP" proofstamp on barrel forward of receiver.
When you get to your gun, look at first 2 digits of ser#, take those two numbers and subtract them from 100, that will be the YOM {year of manufacture}...
example, ser# 243694 100-24 = 76, so the YOM is 1976......
Désolé pour l'anglais j'ai pris d'un autre forum