Proof Half-sovereign, 1817, by Benedetto Pistrucci, laureate bust right, date below, GEORGIUS III DEI GRATIA, rev. crowned shield, BRITANNIARUM REX FID: DEF:, pellet below shield, edge milled, 3.99g. (Montagu 562; Murdoch 192pt.; Nobleman 47/48pt.; Douglas-Morris 135), surface marks, good extremely fine, very rare