Heath's Infallible Counterfeit Detector, Laban Heath
A series running from 1864 to 1889, which aimed to assist the general public with detection of counterfeit paper money. The standard reference to this series is Eric P. Newman's "Heath's Counterfeit Detectors: An Extraordinarily Successful Comedy of Errors," published in the 1991 ANA Centennial Anthology. Entries here are keyed to the Newman numbers presented in the Anthology.
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Newman variety HH-2. The "budget" version of the counterfeit detector, aimed at family use within the home. The ubiquity of the 19th century counterfeit detectors (and market for same) conveys a sense of the scope of the problem - getting stuck with spurious currency was a more common experience than today.