Before an answer can be given, the correct model number needs to be known, as there are many variations of the Marlin Model 336. You will need to check the barrel, receiver and tang of the gun for any additional information, on this particular Model 336. Also, the complete serial number is necessary and percentage of wear on the blued metal parts and the percentage of wear on the buttstock and forearm.
$450
A 1971 Eisenhower Dollar in MS60 condition is worth: $10.00 However it's made of copper-nickel, not silver!
The closest note to that date is the 1973 issue, which is worth $4 in perfect uncirculated condition.
The price range on your shotgun is between 165-200 dollars depending on the amount of finish being between 60%-90%.The Marlin model 120 magnum shotgun was made from 1971-1985.
The original Marlin model 444 was produced from 1965-1971.
The marlin model 781 .22cal rifle was made from 1971-1988.
Your serial number indicates that your Marlin rifle was made in the year 1971.
500-600 in mint condition...maybe 600 with box
A Perfect Vacuum was created in 1971.
Your Marlin model 783 was made in the year 1971.
The best that I can do is say that your marlin model 783 was made between the years 1971-1988.
Your serial number indicates that your Marlin model 336 was made in the year 1971.