Green’s Dictionary of Slang

a silver sixpence.

1819		‘One of the Fancy’ Tom Crib’s Memorial to Congress 25: While the fiddlers (old Potts having tipp’d them a bandy) / Play’d ‘Green grow the rushes,’ in honour of SANDY!
1821		Flash Dict.
1835		G. Kent Modern Flash Dict.
1848		Flash Dict. in Sinks of London Laid Open.
1857		‘Ducange Anglicus’ Vulgar Tongue.
1864, 1867, 1870		Hotten Sl. Dict.
1881		Morn. Bulletin (Rockhampton, Qld) 18 July 2/6: For our next coin in value twenty names are found, viz: - ‘sixpence,’ ‘bandy,’ ‘broder,’ ‘cripple.’ ‘downer,’ ‘fiddler.’ ‘fyebuck,’ ‘half-hog,’ ‘kick,’ ‘lord of the manor,’ ‘pig,’ ‘pot,’ ‘say saltee,' ’sprat,’ ‘snid,’ ‘simon,’ ‘sow's baby,’ ’tanner,’ tester,’ and ‘tizzy’.
1885		Household Words 20 June 155: The sixpence is a coin more liable to bend than most others, so it is not surprising to find that several of its popular names have reference to this weakness. It is called a bandy, a ‘bender,’ a cripple.
1922		Dundee Eve. Teleg. 19 July 2/4: Sixpence is a popular coin in slangdom [...] ‘bandy’ [...] and ‘downer,’ ‘buck,’ and ‘fye-back’.