Slot Machine published 109 years ago by Watling Mfg.
Not listed in MAME yet.
Derby © 1911 Watling Mfg. Co.
Horse Race console.
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Originally designed by Gustav F. W. Schultze as "Derby (Schultze [Gustav Schultze] [San Francisco, CA, USA])" in 1906, Watling Mfg. Co. re-engineered, improved and enlarged Derby in 1911.
As of this writing, only 2 units are known to exist.
Loose Change Blue Book for Slot Machines [4th Edition]