Watch List notes:

SINCONA BRITISH COLLECTION – PART 2. GREAT BRITAIN. GEORGE III, 1760-1820.
Pattern Guinea 1798, London. Struck in silver. By Conrad H. Küchler. Plain edge. No stop after GRATIA. 5.04 g. WR 109. Montagu 676. Sehr selten / Very rare. NGC PF62.
(~€ 970/USD 1'075)

Second finest certified by NGC.