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.
the D in the serial number stands for 1947
first 2 numbers are date code 23 stands for 1977
the serial number 21171 would be from late 1888, the 38W stands for 38winchester also known as a 38-40 caliber. this gun will be either a late model 1888 marlin with top shell ejection, or a very early 1889 model with side ejection, also the model 1889 would be marked marlin safety on top of the reciever. in either case this is a antique black powder cartridge firearm and should not be shot with modern smokeless powder ammo, due do stronger ammo pressures and weaker steel that was used in the guns of this period.
The serial number seems to be incomplet as to which model it is. MP stands for 2008
The Marlin model 336RC which stands for Regular Carbine were made by Marlin from 1948-1968.
the cs on a marlin model 336 stands for carbine standard.
Hi, It is a 1978 Bass S at the beginning of the serial number stands for Seventy preceded by the no 8. S8
Your colt model 1911 commercial (that is what the C stands for ahead of the serial number) was made by colt in 1917.
RW isn't part of the serial no, it stands for Remington Works 1915
it stands for Sweet
There is no model number. The "T" stands for sport.
The T stands for Texan ! they were made in the late 60s to 70s ... I have a 1969 Texan