3-GANG MOWER (Mfr. No. 990180)
These three 21-inch heavy-duty ground-driven mowers with improved hitch cut a swath five feet wide; mow 2-3/4 acres per hour. Shipping weight: 250 lbs.
Source: 1962 Simplicity Lawn and Garden Power Equipment product catalog, courtesy of John Boesch (loan of original) and Steve Johnson (color photocopy)