Watch List notes:

George III (1760-1820), Half-Dollar, oval countermark on Spain, Charles IIII, 4 Reales, 1793, M.F, Madrid Mint, 13.43g (S.3767; ESC 1875 (611)), toned, very fine, the countermark good very fine, scarce.
:S&B 11, March/April 1993, G101
Estimate: £250.00 - £350.00