Definizione

• An English slang term for a counterfeit coin or non-negotiable money. W.S. Jevons, in his work on Money, the Mechanism of Exchange, 1875 (xxi. 289), has the following: "The cheques, bills, [etc.] are regarded by thieves as 'duffer,' with which they dare not meddle."

Fonte

• Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)

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