Game is convertible between replay and add-a-ball operation. The games pictured in this listing show two styles of pop bumper caps. Williams used either of these two styles in their games produced from May 1973 to January 1976. We expect that their flyer predicts the style that was used for the entire production run. Most likely, whenever the caps needed to be replaced, operators used whichever style they had handy, as either one would fit on the pop bumper bodies of the games Williams made during this period.