The backglass carries Gottlieb's famous phrase: Amusement Pinballs, as American as Baseball and Hot Dogs! The backglass is silkscreened with the words "Game Over" and the backbox insert has a hole for a light bulb to light these words but inexplicably the factory did not install a socket or wiring to this hole. This game does have a Game Over Relay, a relay that first appeared in Gottlieb games five months earlier with Gottlieb's 1957 'Royal Flush'. Reportedly, some 'World Champ' games have had this lamp installed after-factory by collectors. The backglass indicates a possible 7-million point score and the schematic shows a lamp socket is wired for this '7'. However, Gottlieb did not actually wire this lamp socket in the game itself. The 100,000 unit stops stepping at 6900, not 7000, making the maximum possible displayed score to be 6,990,000 points. See also Gottlieb's 1957 'World Champ (Extended Play Prototype)'.