Green’s Dictionary of Slang

(UK Und.) a counterfeiter.

1859, 1860		Hotten Dict. of Modern Sl. etc.
1864, 1867, 1870		Hotten Sl. Dict.
1935		R.T. Hopkins Life and Death at the Old Bailey 63: The following crook’s words and phrases date from the days of the old Old Bailey: [...] coiner of bad money – turner-out or bit-faker.