My '69 Swinger 340 window sticker shows T74 E70x14 WSW tires,and came with
E70x14 Firestone Suprbelt red stripe bias belted polyester cord tires with fiberglass belts. The Firestone Wide Ovals that came out in '67 would squirm them- selves into oblivion in 10,000 miles or less,(usually less). My Suprbelts were pretty much used up in 40,000.