George III (1760-1820), New coinage, Pattern Halfcrown, 1817, by T. Wyon, in silver, small laureate bust right, rev. crowned shield with garnishing overlapping the Garter, edge grained, 14.15g/12h (ESC 627; Selig –). Practically mint state, attractively toned, excessively rare £5,000-7,000

Slabbed in NGC holder, graded PF 66