Harrington, n. — Green’s Dictionary of Slang

Harrington n.

[Sir John Harrington (1561–1612) obtained a patent from James I to mint farthings]

a farthing.

1616		Jonson Devil is an Ass II i: I will not bate a Harrington of the sum.
a.1639		Wotton letter 12 Aug. in Rel. Wotton (1672) 558: I have lost four or five friends, and not gotten the value of one Harrington [N].