Watch List notes:

(g) NGC MS64 | William IV (1830-1837), Sovereign, 1836, second bare head right, nose to I, coarse beading on obverse, rev. crowned shield on mantle, edge milled, 8.01g, 5h (Marsh 20; MCE 493; Schneider II, 638; Stratos 135; Spink 3829B), a sumptuous gem, beautifully lustrous with only the faintest wisps of bagmarks, practically as struck, rare in this condition, in NGC holder, graded MS64 (Cert. 6295111-004)

Provenance
The Lansdown Collection of Guineas and Sovereigns