$50-$250 depending upon condition.
Your serial number indicates the year 1987.
Your serial number indicates that your Marlin model 782 was made in the year 1977.
1976
Your Marlin model 783 was made in the year 1971.
1978
150$ to 250$ is my best guess
You will need to add the serial number,to get the answer to your question.
Your original model 1893 Marlin rifle was made in the year 1906,with the serial number that you have provided.
Your serial number indicates that your model 782 rifle was made in the year 1981.
Made in 1963
Your Mossberg was made prior to 1968, and will not have a serial number unless made for the US Military. SNs were not required by law on rifle and shotguns until 1968. Patent Pending means that a patent has been applied for- but not yet granted- on some mechanism in that rifle.
$350-400 in PERFECT shape.