The year of manufacture for H = 1951. New type of trigger and sear in Model 336.
By including the serial number in your question,we will be able to answer when your Marlin model 336 was produced.
You need to include a serial number to get a answer.
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.
the cost 3030 cal 336sc
The rifle is a marlin 336. Serial number is located on 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 R prefix to your serial number indicates that your Marlin model 336 rifle was produced between 1957-1958.
The Marlin model 336 will sell for between 200-350 dollars,depending on overall condition.
300-500 USD
Model variation
I found on the web site below, that a 336 Marlin with the serial number that begins with a "P", was manufactured in 1957. http://oldguns.net/cgi-bin/f2f/f2f.pl?http://oldguns.net/q&a1_05.htm
Between 200-350 dollars depending on overall condition of the wood and metal,and a good bore.