Simplicity 524 5 HP 2 Stage Snowbuster Snow Thrower Model 1690379 Great ShapeYou are looking at a Simplicity 524 5 HP 2 Stage Snowbuster Snow Thrower. Simplicity Allis Chalmers Company. It is in excellent original shape for a collector. 2 owners Father and Son. Side shaft chain driven. 5 HP Tecumseh engine. TA Motorsports.