Great Britain, Hanover. William IV (1830-1837) AV Proof 1/2 Sovereign. London mint, 1831. GULIELMUS IIII D:G: BRITANNIAR: REX F:D:, bare head right / Crowned coat-of-arms, ANNO 1831 below. KM 720; Friedberg 384.
NGC graded Proof 62 Ultra Cameo (#4422489-024).
From a private Swiss collection.