“20 million people have switched to Champion Spark Plugs.”
Featuring English racing champion John Cooper at California’s Ontario Motor Speedway in ’71. Daily 70s Ad #41: Champion Spark Plug Motorcycle Classics originally appeared in the January, 1972 issue of American Motorcyclist magazine.
(Source: American Motorcyclist)
Previously on Daily 70s Ad: Emerson Permacolor TV (1972)