1978 is the exact year.
To find the year of manufacture subtract the first two digits from 100, that will give you the year. Hence, 100 - 22 = 78, so that rifle was manufactured in 1978.
Marlin is still using this system currently so firearms made this year 2009, will start with the serial number 91, 100 - 09 = 91.
Your serial number indicates that your Marlin model 782 was made in the year 1977.
Your Marlin model 783 was made in the year 1971.
You will need to add the serial number,to get the answer to your question.
150$ to 250$ is my best guess
1978 is the exact year. To find the year of manufacture subtract the first two digits from 100, that will give you the year. Hence, 100 - 22 = 78, so that rifle was manufactured in 1978. Marlin is still using this system currently so firearms made this year 2009, will start with the serial number 91, 100 - 09 = 91.
Your serial number indicates that your model 782 rifle was made in the year 1981.
$350-400 in PERFECT shape.
250-375 dollars depending on overall condition of the rifle in question.
Your serial number indicates the year 1987.
Check the receiver and barrel.
Check the barrel and receiver.
Check the frame and barrel.