A cap with the iconic 76 logo of the American Gas Station brand.
Union Oil introduced "76" gasoline in 1932. The name referred to the 1776 United States Declaration of Independence, and was also the octane rating of the gasoline in 1932. Many stations had the 76 ball rotate when the signs were illuminated. The first such sign was designed in 1962 by advertising creative director Ray Pedersen for the Seattle World's Fair.