Before revision: "Pilot" magazine, June 1985 pages 5-6 Peter Williams' 1973 Formula 750 TT-winning John Player Norton racer was an early example of a semi-monocoque URL
After revision: "Pilot" magazine, June 1985 pages 5-6 Peter Williams' 1973 Formula 750 TT-winning John Player Norton racer was an early example of a semi-monocoque motorcycle.