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I would check the lower tang,under the lever.
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.
By including the serial number in your question,we will be able to answer when your Marlin model 336 was produced.
2.50
Your Marlin model 30AS was made in the year 1984.
the cost 3030 cal 336sc
100-400 USD
Your Marlin model 336RC(regular Carbine) was made in the year 1966 with the 2 letter prefix of AB to your serial number.
Circa 1983-2000 was part of the Glenfield production lineup and became the model 336 in Y2K. Value somewhere from $100 to $325 Hope that helps! Blue Mt Gunworks
The R prefix to your serial number indicates that your Marlin model 336 rifle was produced between 1957-1958.
1990