This is the first pinball machine by an American manufacturer to have the familiar round up-post between the flippers. Chicago Coin referred to this feature as the Ball Saver. The first known example is found on Rally's 1967 'Play boy'. An earlier, V-shaped form of this device was used on Gottlieb's 1950 'Knock Out' and Chicago Coin's 1951 'Thing'. The Gun Smoke flash feature on the backglass was first used on Chicago Coin's 1967 'Twinky'.