Marlin Lever Action Barn Find

[Pirate52]

I recently fount an old rusted Marlin octagon barrel rifle. The barrel is 27” long. It looks like the rifle only has 3 digits. How would I start identifying the Model and Caliber? Marlin Manufacturer is stamped on on top ahead of rear sight. Can’t find any other markings. Thanks in advance for the help.

[Road King]

Not much to go on. Really need photos.