Watch List notes:

NGC MS64+ | George IV (1820-1830), 'Garter' Halfcrown, 1824, Type 2, edge milled, 14.11g, 7h (Davies 182; Bull 2367; ESC 636; Spink 3808), a rim clamp mark at 1 o'clock, otherwise delightfully cabinet toned overlying lustrous surfaces, a most pleasing extremely fine, in NGC holder, graded MS64+ (Cert. #6295510-009) [Top Pop].
This coin pips the previous 'Top Pop' offered in the recent Mildenhall sale, where it attained $2,400 on 13 October 2021.
Estimate: £600 - £1,000