I took some picture but I don't know how to post them. The number that is stamped behind the hammer is 21263561.
2000 - 21 = 1979
It was made in 1979.
Without seeing pictures, if the metal is in good condition, bluing not worn and no rust...$375 to $500 and up. If you sell it to a gun shop they will offer you about $225 so don't do that.
The pre-Freedom Group buy of Marlin are in demand right now and the pre-crossbolt safety ones even more so.
It's like this, it's the longest running 22 caliber rifle of all time and are still in production. But, in a way certain features and quality has changed so it almost like they are out of production.
With that being said...they aren't making them like the used to so the price on the older ones will continue to climb. People that know better will not buy a new Marlin 39 when the older ones are so much better. The quality of the new stuff from the "new" Marlin has dropped.
I know a guy that buys and sells guns a lot. He bought a 1958 Marlin 39 Mountie for $350 four years ago, he sold it on an auction site with no reserve and a penny opening bid for $830 last winter.
BlueBook is way off on their values for these rifles, they are selling for far more.