George III (1760-1820), Proof gold Half-Sovereign, 1817, engraved by Benedetto Pistrucci, laureate head right, date below, legend GEORGIVS III DEI GRATIA raised rim both sides, rev. inverted die axis, crowned shield of arms, dot below, REX FID: DEF: BRITANNIARUM, edge milled (WR 204; S.3786).
20-30 coins known only
Very rare
Certified by NGC PF61
