Green’s Dictionary of Slang

a sixpence.

1839		H. Brandon Dict. of the Flash or Cant Lang. 165/2: Snid – sixpence.
1859		Matsell Vocabulum.
1864, 1867, 1870		Hotten Sl. Dict.
1881		Morn. Bulletin (Rockhampton, Qld) 18 July 2/6: For our next coin in value [i.e. sixpence] twenty names are found [...] ‘Fyebuck,’ ‘half-hog,’ ‘kick,’ ‘lord of the manor,’ ‘pig,’ ‘pot,’ ‘say saltee,' ’sprat,’ ‘snid,’ ‘simon,’ ‘sow's baby,’ ’tanner,’ tester,’ and ‘tizzy’.
1890–1904		Farmer & Henley Sl. and Its Analogues.
1922		Dundee Eve. Teleg. 19 July 2/4: Sixpence is a popular coin in slangdom [...] ‘half-a-hog,’ ‘kick,’ (thus two and a ‘kick’ 2s 6d)‘lord of the manor,’ ‘pig,’ ‘pot,’ ‘snid,’ ‘sow’s baby’.