George III (1760-1820), Pre-1816 issues, Proof Farthing, 1799 (late Soho), in gilt-copper, edge obliquely grained, 6.33g/6h (Cooke 295; BMC 1272 [KF 8]; Selig 1428; S 3779). Light hairlines, otherwise brilliant and almost as struck £400-£500