Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip III, assayer T, Grade 3. S-P21; KM-9. 9.27 grams. Bold full shield despite moderate corrosion all over, somewhat silvery. With original Fisher tag and certificate 86A-136054, pedigreed to the J.P. Silberman Estate.Recovered from: Atocha, sunk in 1622 west of Key West, Florida.

Estimate: $500 - $750