Spark Plug

Slot Machine published 90 years ago by Bally Mfg. Co.

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TECHNICAL/MACHINE PICT.

SOURCES

Machine's picture.
For Amusement Only - Thomas Gustwiller - Taylor Printing - 1995 - Page 99
The Coin Machine Journal - January 1940 issue
Loose Change Blue Book for Slot Machines [4th Edition]