Coin Slot #15. Guide to the Mills Mystery "Blue Front"

Including a guide to the Silent Mystery Front Vender "Cross Diamond," Extraordinary Mystery "World's Fair," Mystery Vender "Blue Front," Future Play "Red Front," Cherry "Bursting Cherry," Melon "Diamond Front," Blue Front, Brown Front "Drill Proof," Mystery Club Bell, Chrome Mystery "Diamond," Gold Chrome, Emerald Chrome, Copper Chrome and other Mills Mystery Bell machines with serials 310,000 through 483,000.