1919
Early 1913
Remington Model 550-1 does not have serial numbers.
1955.
1968
1950
1981
your marlin model 336A was made by marlin in 1950.
The G prefix to your serial number shows that it is a model 70 Winchester rifle.It should say this on the barrel of your rifle.
It describes the model of the firearm.
1952
Your Marlin model 336CS(Carbine Sporter)was made in the year 1987.