A wench. A prime article. A handsome girl. She’s a prime article (Whip slang), she’s a devilish good piece, a hell of a goer.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Articles * AskNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes