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Actually, tokens. Wikipedia article.
https://en.wikipedia.org/wiki/File:Horn_%26_Hardart_Automat_Brass_%22F%22_Token.jpg

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Main Wikipedia Horn and Hardart (very long, much info) article:
https://en.wikipedia.org/wiki/Horn_%26_Hardart
" .. ..... In 1987, Horn & Hardart opened two 1950s themed Dine-O-Mat restaurants in New York. They closed in 1989, after less than two years in operation.. ... .... The last New York Horn & Hardart Automat (on the southeast corner of 42nd Street and Third Avenue) closed in April 1991. "

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Robert