Vintage 1976 magazine print ad featuring Bobby Unser and Champion Spark Plugs. This black and white ad showcases the excellence of the brand and its products. Perfect for any collector interested in advertising from the 1970s, this piece is a great addition to any collection. The ad was created in the United States and highlights the success of Bobby Unser in the 1976 Indy 500, Formula One race. Original full page vintage magazine print ad.