Jumbo [Model 29] © 1935 Bally.
Model number : 29
Released in August 1935.
An updated version was available later as "Jumbo [Ticket Model 46]" & "Jumbo [Payout Model 45]" that included a drawer for batteries making them easier to change.
Design by : George H. Miner
Collector's Guide to Vintage Coin Machines - Richard M. Bueschel - Page 98
The Coin Machine Journal - January 1940 issue
Loose Change Blue Book for Slot Machines [4th Edition]
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