Watch List notes:

The Hardcastle Collection | ALMOST UNCIRCULATED 53 | George III, Emergency Issues, Countermark Half-Dollar, oval counterstamp on Charles IV 4-Réales, 1792-MF, Madrid (ESC 1875 [611]; S.3767), host coin very fine, countermark good very fine with a pleasing tone, in NGC holder, graded AU53 - C/S UNC Std (Cert. #5878623-002) [Tied 1 of 4 / 7 Finer].

Estimate: £400 - £500