For ANY Model 336 from:
1940-1968 a letter was leading the Serial#...
1969-1972 only the first two numerals of the Serial# indicate actual year (69, 70, 71, 72) of production...
1973-2000 this is where someone would subtract the first two digits (which range from 27 to 00) from 2000 to get year of production...
2001 'till 3000... the first two digits (99, 98, 97 and so on) subtracted from 100 will give the 20xx date of manufacture...
By posting the serial number to your rifle in this question.
Find a copy of the company history written by Brophy and look it up in one of the many sn tables.
Your Marlin rifle was made in the year 1987.
Your Marlin rifle was made in the year 1982,with the serial number that you have provided.
You will need to provide the serial number to your Marlin model 39 lever action .22cal rifle to get a date of production.
Your serial number indicates that your Marlin model 30AS was made in the year 1984.
The letter U which is a prefix to your serial number is used to date the production of your Marlin lever action rifle.In this case the letter U indicates that your rifle was made by marlin in the time frame of 1960-august of 1961.
J prefix is 1952 date of manufacture
By posting the serial number to your rifle in this question.The model 30AS was made from 1983-1999.After the year 2000 this rifle was desiginated the model 336AS,and then the model 336A.This time frame was from 2000-2007.
1976 24 (the first two digits) from 2000 = 1976 I have a 30A that is a 1976 gun.
If the gun was manufactured in 1948 or after, the serial number is traceable. Usually the first letter or first two numbers indicate the manufacture year. If the gun was made before 1948, the only date available is the shipped date, and those may not be accurate and/or may be duplicated.
Your browning lever action 22 was made in 1976.