Watch List notes:

(g) William IV (1830-1837), Experimental Small Flan Half-Sovereign, 1834, bare head right, rev. crowned shield on mantle, edge milled, 3.99g, 6h (Spink 3830; Marsh 410; MCE 495; Stratos -), a marvellous coin, choice mint state, in NGC 'Sweetnam' holder, graded MS63 (Cert. #5878636-013).

Estimate: £1,500 - £2,000