Great Britain
George III Counterstamped 1/2 Dollar ND (ca.1797) AU Details (Rim Filing) NGC, KM622.1. Small oval counterstamp upon Spain 4 Reales 1794 M-MF of Madrid. Both the counterstamp and the host coin are unusually choice for this type. Far scarcer than the similar 8 Reales counterstamps.
Estimate: 500-600 USD