Green’s Dictionary of Slang

Hans Carvel’s ring n.

the vagina.

1768		Gentleman’s Bottle-Companion 15: Here’s ring of Hans Carvel , may ev’ry buck win it.
1785, 1788, 1796		Grose Classical Dict. of the Vulgar Tongue n.p.: Carvel’s ring, Hans Carvel, the private parts of a woman. A jealous old doctor, being in bed with his wife, dreamed that the Devil gave him a ring, which, so long as he had it on his finger, would prevent his being made a cuckold, waking, he found he had got his finger the Lord knows where.
1790		‘Bumper Allnight. Esquire’ Honest Fellow 187: [Jason] slept, ’tis said, a dozen days, / Nor once assum’d Hans Carvel’s ring.
1801		J. Churchill ‘Hans Carval’ in Poems II 115: ‘Carval...full well I know thy pain; / But, lay thy cares aside; Wear but this Ring...and then, in vain / Shall Rakes assail thy bride.’ / [...] / ‘Thanks, Master Satan,’ said the Clown / [...] / Ten thousand thanks!’ ...he woke and found / His finger...you know...where.
1811		Lex. Balatronicum.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1896		Farmer Vocabula Amatoria (1966) 14: Anneau, m. the female pudendum; ‘the ring’. Also l’anneau de Hans Carvel.