Coin Slot #17. Guide to the Mills 1926-1931 Gooseneck Operator Bell, Counter O.K. and Front O.K.
Including a guide to the Mills Operator Bell straight Bell, Counter O.K. side vender and F.O.K. front vender Bells, Totalizer, Baseball and other standard and specialty Mills Gooseneck Bell machines with serials 140,000 through 250,000.