Watch List notes:

(g) William IV (1830-1837), 'Lightweight' Proof Sovereign, 1831, by Wyon (after Chantrey) and Merlen, second bare head right, W. W. with stops on truncation, rev. crowned shield on mantle, edge plain, 7.58g, 4h (Murdoch III, 440(b); Nobleman 205/6(a); Douglas-Morris 179; Bentley 24; W&R 261 [R3]; Marsh 11A; Spink 3829B), an evidently early or more probably original '1831 striking' with inverted die axes as customary for currency issues of the period, a stunning example with only a trace of scattered hairlines in otherwise gloriously brilliant fields all framing a striking high relief portrait with full cameo frosting, practically FDC, , This lot is also offered as a group lot in lot 280. Whichever reaches higher hammer price will sell and the other option will be withdrawn..
Provenance
The Gemini Collection
, ,
NGC PF63 ULTRA CAMEO (Certification #5880299-001)
, https://www.ngccoin.com/certlookup/5880299-001/63/
Estimate: £6,000 - £8,000