Ok, so mine doesn't look anything like that, my action looks almost identical to the action of the model 60 marlin. I wish mine looked as clean as yours does though, nice gun.
The reason I assumed my gun was only made for about one year was because of this paragragh from the link, the last sentence is where I got the idea.
>>> Nineteen-fifty-nine was a busy time for the Levermatic lineup. In addition to the 56 DL, Marlin also introduced two tubular-magazine short-stroke lever rifles. The Model 57 was chambered for .22 Short, Long or Long Rifle, and the Model 57M was made for the new .22 Winchester Magnum Rimfire (.22WMR) cartridge. After Winchester announced the .22 Magnum cartridge in 1959, Marlin required only a slight redesign of the basic Levermatic mechanism to adapt it to the new rimfire cartridge. Thus, Marlin was able to beat Winchester into production. Winchester did not market a rifle to shoot their new cartridge until 1960.
The Model 57 rifles were introduced with curved aluminum receivers, but in 1960, Marlin reportedly reverted back to the squared steel receivers for the Levermatic rifles.
ex U.S.Navy Submariner 1985-1989
USS Sturgeon SSN 637