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Bally Derby,

Features: 1 ball for 5 cents. Incorporates "Odds and Payout" units. It dispenses 5 cent coins when a skill shot is made into a hole on the playfield, the amount depending on the current odds. There is an electric motor that drives the payout unit. The odds drum coil is activated when the ball rolls over a leaf switch beneath the playfield. There is a mechanical timer (similar to a wind up watch) that will run out after about 10 minutes. The timer has a lever which activates a continuity switch. The game originally ran on batteries, but many were converted to run on power outlets via a 110VAC/12VDC transformer. Advertised as 50 inches long by 24 inches wide.
Manufacturer: Bally Manufacturing Corporation (1931-1983) [Trade Name: Bally]
Date of Manufacture:
Players: December 09, 1935 / 1
Model Number: 66
Theme: Horse Racing - Payout
Design by: Bon MacDougall
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Machine Type: Electro-mechanical (EM) 
Notes: Also available in a ticket model. Bally documentation indicates this game had a release (to production) date of 12-9-35. The changing odds feature on the backglass was Bally's first use of it, moved from the playfield of PAMCO's 1935 'Pamco Parlay' by the designer of that Pamco machine, Bon MacDougall, now employed at Bally. An Automatic Age ad, Feb-1936 page 75, states "Manufactured under exclusive arrangement with Pacific Amuse. Mfg. Co." According to Marketplace Pictorial History, this new changing odds feature marked the beginning of the bingo machines.
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