1736 Canting Dictionary / IJ / JACK [money]
a Farthing; He wou'd not tip me a Jack, Not a Farthing wou'd he give me.
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Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Jack in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).