I believe the Eastland Act of 1962 was the reason Bally shipped most of its subsequent production overseas. The Johnson Act of 1950 (or maybe it was 1951) effectively killed the one-ball horse race games, and the Eastland Act of 1962 was intended to similarly dispatch the bingos. See the following articles for quotes by Bill O'Donnell, Bally's general sales manager. If he's being truthful, Bally didn't know if they would produce another bingo following Silver Sails, the final game before the Eastland Act took effect. So Bally did well to keep bingos in production for another eighteen years or so!