Watch List notes:

(g) MS62+ | George III (1760-1820), Half-Sovereign, 1817, 'New Coinage', laureate head right, rev. crowned shield, edge milled, 6h (Stratos 51-52; Marsh 400; MCE 467; S.3786), lustrous, good extremely fine, in NGC holder, graded MS62+ (Cert. #5880349-001) [Tied 1 of 4 / 57 Finer].
https://www.ngccoin.com/certlookup/5880349-001/62/
Estimate: £1,500 - £1,800