Your gun should have a model marked on the upper tang, behind the hammer.There may be a flip up tang sight mounted there with two screws which will have to be removed to find the model.
In addition, a proper wood-to-metal fit is a critical indicator of quality in a lever rifle.
In the past, the company made shotguns, derringers and revolvers.
Marlin owned the firearm manufacturer H&R Firearms.
For example, there are 6 distinctly different variations manufactured for the Marlin Model 60.
Marlin has been making lever-action rifles since 1881, and in 2008, they produced their 30 millionth lever-action rifle, which was donated to the National Rifle Association.