Green’s Dictionary of Slang

(UK Und.) a coloured handkerchief, presumably with spots.

c.1698		B.E. Dict. Canting Crew n.p.: Speckt-wiper c. a colour’d Handkerchief.
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		Grose Classical Dict. of the Vulgar Tongue n.p.: He drew a broad, narrow, cam, or speckt wiper, he picked a pocket of a broad, narrow, cambrick, or coloured handkerchief .
1788, 1796		Grose Classical Dict. of the Vulgar Tongue (2nd, 3rd edn) n.p.: He drew a broad, narrow, cam, or speckled wiper; he picked a pocket of a broad, narrow, cambrick, or coloured handkerchief.
1811		Lex. Balatronicum [as cit. 1788].
1823		Egan Grose’s Classical Dict. of the Vulgar Tongue n.p.: Specked whiper A coloured handkerchief. Cant.