G=1950, and SC=Sporting Carbine.
You need to include a serial number to get a answer.
By including the serial number in your question,we will be able to answer when your Marlin model 336 was produced.
With the serial number that you provided,your Marlin model 1893 rifle was made in the year 1899.
Your serial number indicates that your Marlin model 30A was made in the year 1979.
The letter F prefix to your serial number indicates that your Marlin rifle was made in the year 1949.
the cost 3030 cal 336sc
The rifle is a marlin 336. Serial number is located on the lower tang under the lever.
I would check the lower tang,under the lever.
Your Marlin model 336RC(regular Carbine) was made in the year 1966 with the 2 letter prefix of AB to your serial number.
The 336 began production in 1948. It can not be a 336 and made in 1917. Cross reference your serial number ... google Marlin Serial numbers and click on an applicable site.
Your Marlin model 30AS was made in the year 1984.
The R prefix to your serial number indicates that your Marlin model 336 rifle was produced between 1957-1958.
they all have a serial number it might be under the fore grip The model 336 was introduced in 1948 and almost certainly has a serial number.
How old is the Model 94 Winchester 3030 serial 4554129?
there is a marlin collectors site or gunbroker.com
Take the first two digits of your serial number, in your case 20 and subtract that from 100. Your gun was made in 1980. Skeeter
Between 200-350 dollars depending on overall condition of the wood and metal,and a good bore.