George IV (1820-1830), Proof Crown, 1821, error edge tertio, 28.09g (L & S 15; ESC 250; S 3805). Brilliant and deeply toned, extremely rare (£2,000-2,500)

Provenance:
Dr D Rees-Jones Collection, Spink Auction 117, 19 November 1996, lot 218;
Allen Graves Collection.

Die-axis 6h. See Colour Plate I