You do not state what model of marlin you have?I can say that if you have a model 1881,1888,1891,1892,1893,1894,or 1897 marlin with the serial number you provided it was made in the year 1900.
Impossible to answer without a sn. MOD 336 SER 5448892
mod 97 ser 339974
1961
ser.#AO24506
U is for 1961
I would try the marlin firearms web site for a answer to your question.PLese be sure which model marlin you have.
your model 1898 marlin shotgun was made from 1898-1905 with a total production of 67,000 guns.I would assume that with that serial number it was made in 1898 or 1899.
between 1916-1925
A serial number would be required to identify the year of manufacture of your Marlin model 60.
With the serial number that you have supplied,your Marlin(Glenfield) rifle was made in the year 1980.
i have a marlin 30-30 model 1893 ser# 2113xx can you tell me the value of it thanks rick
http://oldguns.net/sn_php/marlinlookup.php this web sight will not allow the (B) in the serial number and it is a key factor