George IV (1820-1830), Proof Sovereign, 1830, edge grained, 8.00g/12h (WR –; M –; S –). As struck; unrecorded as a proof and believed unique (£30,000-50,000)

Prior to the discovery of this coin, the only known proof-quality gold coins dated 1830 were the pattern sovereigns of William IV (WR 259-60), who succeeded to the throne on 26 June 1830. This coin has been confirmed as genuine by the Royal Mint