Potosi, Bolivia, cob 8 reales, Philip III, assayer not visible, NGC Shipwreck Effect / Nuestra Senora del Rosario (stated on label). KM-10. Heavily corroded piece with faint shield and cross detail, two natural edge-cracks, darkly toned. NGC #2036290-036. From: "Dry Tortugas wreck," sunk ca. 1622 west of Key West, Florida
($150-225)