Watch List notes:

George III (1760-1820), Pattern Proof Guinea, 1763, by Richard Yeo, GEORGIVS • III • DEI • GRATIA •, second laureate bust right, top leaf to right of second stop, rev. • M • B • F • ET • H • REX • F • D • B • ET • L • D • S • R • I • A • T • ET • E •, crowned shield of arms, edge plain, 7.63g, 12h (Farey 1505; Waterbird 20 same dies; W&R 87 var.; Bull 745 [R7]), previously polished with resultant brightness to fields, yet no evidence of smoothing to plain edges despite the underweight flan, hints of reddish-orange peripheral tone to reverse legends, otherwise brilliant, a stupendous canon of Yeo's approved currency design, the second example recorded from this newly discovered 'Waterbird' obverse die, of the highest rarity thus.
provenance
Baumhauer, Part 2, Sincona 75, 16 May 2022, lot 237 - 'Altered Surfaces'
SNC, August 2000, no. 3127 - "polished, reverse with a red toned, good EF, and extremely rare" - £1,950
Estimate: £8000 - £10000