Watch List notes:

William IV (1830-1837), Proof Shilling, 1831, bare head right, block W. W. on truncation, rev. value in wreath, edge plain, 5.68g, 7h (ESC 2488 [1266]; Spink 3835), an evidently early or more probably original '1831 striking' with inverted die axes as customary for currency issues of the period, with a striking charcoal-electric blue tone, much as struck, rare, , 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 Whichever reaches higher hammer price will sell and the other option will be withdrawn..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 (Certification #5880299-004)
, https://www.ngccoin.com/certlookup/5880299-004/63/
Estimate: £500 - £800