Watch List notes:

BRITISH COINS, George III, Silver Halfcrown, 1820, large laureate bust right, date below, rev quartered shield of arms with an escutcheon of the Arms of Hanover upon crowned Order of the Garter surrounding, edge milled (ESC 625; S 3789). One or two tiny hairlines and nicks to obverse, a few raised die flaws, otherwise extremely fine, lightly toned.
from the David Sellwood collection

Estimate: £400-500