150$ to 250$ is my best guess
Seems to be a descrepency here. There were no model 36 marlins made with Microgoove barrels. The model 336 was made with a Microgroove barrel, and if that's what you have then your's was made in 1972.
the year is 1977
53 years old.
Check the receiver and barrel.
Check the barrel and receiver.
Check the frame and barrel.
Look on the barrel and receiver.
how much does it cost a 1983 marlin 38-55 hex barrel?
85 years
Your serial number indicates that your Marlin model 782 was made in the year 1977.
Check the receiver and barrel.
go to: Marlinfirearms.com and pose the question to them