Thats the self-propelled model. They used to sell those at Lowes and other big-box stores. It is worth saving. It has the "V" "Silver Series" engine. Piston and rings same as the "F" engine. Seals the same as lawnboy used from the 1960's up thru this model. You can exchange the engine, or engine block with any other "V" engine, if your engine is not salvagable. The self-propelled and non-self-propelled models both use the same identical engine. The self-propelled model just added a belt-pulley on the drive shaft secured with a set-screw. Same drive shaft., etc. The steel decks and upper muffler plate are different to acomodate the belt. There is a treasure-trove of reusable parts on this, even if the engine is junk due to being mis-fueled. The self-propelled transmission, the wheels, the control cables for throttle and flywheel brake, the carb, possibly the magneto, lots of stuff that would cost $$ if you bought the parts individually.