Potosi, Bolivia, cob 4 reales, Philip III, assayer not visible, Grade 3. KM-9. 7.91 grams. Nearly full shield and cross despite heavy corrosion with small pieces of edge missing, silvery. With Fisher tag and photo-certificate #141681.Recovered from: Atocha, sunk in 1622 west of Key West, Florida
($300-$450)