
I've Googled for an hour, but there is precious little *definitive* explanation. But from what I've gathered from other forums, sort of by osmosis, is mine IS a Mountie. Straight stock, straight lever, shorter 20-inch barrel, gold trigger.
Wikipedia, while far from the inarguable last word, states, "Additionally "mountie" versions have been produced at various points in the rifle's life which featured a shorter 20" barrel and a straight stock. These rifles have been alternately called Model 39M or 1897 Mountie." Even Marlin's official site does not specifically match the -M designation to the Mountie variation. What say ye collectors?
Next to a newly-acquired, but used, Model 60:

More pix on my smugmug site.