The "Heavy Duty" script wars began in the 70's and Maytag was behind the times of this false advertisement gimmick so these cheesy stickers were the last minute answer. If you look at the washers of this era: Whirlpool/Kenmore belt drives, GE Filter Flos, Frigidaire 1-18, ect, they have this notation on the console. Maytag incorporated "Heavy Duty" into the console beginning with the 12 series machines (around '83-'84) which continued through to the last orbital washer in 2006.