George III (1760-1820), Pre-1816 issues, Proof Half-Guinea, 1787, by L. Pingo, in gold, laureate head right, rev. crowned spade-shaped shield, edge plain, 4.96g/12h (WR 130; S 3735; Selig 1151-2). A few edge and surface marks, otherwise good extremely fine, rare (£1,200-1,500)