George III (1760-1820), Pre-1816 issues, Proof Halfpenny, 1806 (late Soho), in gilt-copper, edge centre-grained, 12h (BMC 1362 [KH 36]; Selig 1401; S 3781). Virtually mint state, rare thus [certified and graded by NGC as PF 65 Cameo] £1,200-£1,500