The manufacturer produced the backglasses in both crystal glass and Plexiglas.
In the center of the motor board is a 10-pin jack with a 4-pin shorting plug. This jack would accommodate an Added Balls Kit (part number K-313-2), likely ordered separately by the operator, for extra-ball operation. The kit is a relay wired to a plug. When this relay is installed in place of the shorting plug, the Balloons feature can be optioned to award extra balls, replays, or 500 points. The high scores can be optioned to award either extra balls or replays. Only one extra ball is awarded per ball in play, and the backglass will indicate SHOOT AGAIN and a yellow indicator on the apron will illuminate. The shorting plug, when installed, allows the Balloons and high scores to award only replays.
The add-a-ball only version made for export is Bally's 1967 'Surfers'.
