Many machines seem to have issued tokens rather than mints (or possibly as payout in addition to mints). In many cases, these tokens could probably be exchanged for cash "under the counter." Mints or candy are mentioned on many different tokens from this period.
J. H. Keeny & Co. (center token) made amusement and gambling machines in Chicago. Keeny was bought by Mills Novelto Co. in the 1960's.
Some machines also disguised themselves as vending machines by giving cigarettes or cigars rather than mints.
Sparks (right token) was a similar slot machine also made by Groetchen, and was introduced in January of 1938.
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