Great Britain. Half-Dollar, ND (c.1797). S. 3767; ESC-611; KM-A622. George III/Charles IV Potosi oval countermarked 1786-PR 4 Reales. Unusually nice grade. Very rare and catalogues £1500 (around $2000) in XF. PCGS graded Countermark AU Detail, Coin EF-40. Estimated Value $800 - 1,000