Watch List notes:

BRITISH COINS, William IV (1830-1837), Proof Crown, 1831, bare head right, W.W. incuse on truncation, rev crowned mantle over quartered shield with escutcheon of the arms of Hanover, within Order of the Garter, date below, edge plain (ESC 271, R2; L&S 1; S 3833). Pair of parallel hairline scratches behind head in field only, otherwise practically as struck, toned and scarce.
With old ticket (from the family that also own the 1839 Proof Set, lot 3573), stating that this coin was bought from an auction sale named as B Jefferi's by Alexander and Co. on 26 November 1896, lot 256, selling for £11.

Estimate: £12,000-15,000