FIVE SHILLINGS. The crown. TEN SHILLINGS. The two crowns. FIFTEEN SHILLINGS. The three crowns.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Sign of a House To Let * SilenceNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes