Green’s Dictionary of Slang

(UK Und.) a guinea.

1674		Head Canting Academy (2nd edn).
c.1698		B.E. Dict. Canting Crew n.p.: Husky-lour c. a Guinea, or Job.
1707		J. Shirley Triumph of Wit.
1725		New Canting Dict. [as cit. c.1698].
1737, 1759, 1760, 1776		Bailey Universal Etym. Eng. Dict. [as cit. c.1698].
c.1750–1882		B.M. Carew Life and Adventures.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue.
a.1790		H.T. Potter New Dict. Cant (1795).
1809		G. Andrewes Dict. Sl. and Cant.
1811		Lex. Balatronicum.
1835		G. Kent Modern Flash Dict. 18: Huskey lour – a guinea, a gold coin.
1848		Flash Dict. in Sinks of London Laid Open [as cit. 1835].
c.1850		Duncombe New and Improved Flash Dict.