John Marlin's "Special Smokeless Steel" barreled rifle, designed to handle longer cartridges of the brand-new smokeless variety (as opposed to black powder).
Marlin did make a later Grade B model with a softer barrel specifically marketed and marked "For Black Powder". Model 1893 serial numbers are stamped into the bottom front end of the trigger plate; the highest reported s/n to date is 448,355. A total of 69,100 Model 1893 rifles and 4,086 carbines were produced from 1893-1906. After 1906 the "S" crescent, or sporting carbine, model was introduced.