Butterfly Rollovers

A type of Rollovers with a distinctive butterfly-wing shape that flips open when the ball passes over, then springs closed again. The butterfly mechanism provides clear visual feedback — the “wings” fan outward on contact — while the switch beneath registers the score. Bally featured butterfly rollovers on Grand Tour / Happy Tour (1964), using the eye-catching flipping motion as both a scoring mechanism and a playfield decoration. A short-lived design from the Electromechanical era, butterfly rollovers appeared on only a handful of machines before simpler Star Rollovers and Rollover Buttons became the dominant rollover types.