I can't tell you much. They were made from 1963-1969. They looked good, but were never big sellers. They were chambered for .256 Magnum (the round first chambered in the Ruger single shot Hawkeye) and .30 Carbine. One problem was that in many states, .30 Carbine is not powerful enough for deer hunting, which restricted the rather expensive Marlin and its ammo to plinking. While the .256 was used as a varmint round, it really was a pistol cartridge and couldn't compare with real varmint cartridges like the .222.
Unlike the Ruger, which can bring a couple of grand these days, the Marlin will bring a top of about $400 in the .30 Carbine, and a hundred or so more in the .256.
Jim