Simplex Triple Jackpot © 1929 Dean Novelty Co.
This is a conversion kit for a Mills Operator Bell (AKA gooseneck bell). The conversion added jackpots to the Mills machine and included a simplified more modern looking front plate to the machine.
Cost for the conversion kit was originally $12.50 (tax paid).
Loose Change Blue Book for Slot Machines [4th Edition]
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