Per Billboard, Nov-5-1966 page 75, this game was launched at the Chicago MOA show held Oct 28-30, 1966.
The first of two games pictured here has hand-drawn labels and notations but no serial number, indicative of an Engineering Prototype. A small metal Property Tag ("Prop No. 3238") is riveted to its cabinet below the right flipper button where the serial number normally would be stamped in production games. The cabinet art matches a later game, Bally's 1971 'Firecracker', but with different colors. Still, the cabinet is original to the prototype because hand-labeled papers are stapled to the inside of it. Note the area around the flippers is unpainted and does not have the black horizontal bars as shown in the second game.
The 3-inch flippers shown on this prototype are not the original size of flipper used for this game. Also, the center playfield has a rollunder spinner. This spinner was likely a user modification, as Bally did not put them on their games until 1974.
The second game shown here does not have a spinner and does have the expected smaller flippers. It is assumed to be a 'production' game but, interestingly, a serial number could not be found anywhere on it, or in it.
Reportedly, 'Six Shooter' is the first Bally game having a motorized trip relay bank, a device Bally didn't use again until Bally's 1968 'RockMakers'.
