Potosi, Bolivia, cob 4 reales, Philip III, assayer T, Grade-1 quality but no Grade on certificate. S-P21; KM-9. 13.50 grams. Odd shape but no corrosion at all, good full cross and nearly full shield, toning around details. With Fisher certificate #153287. Recovered from: Atocha, sunk in 1622 west of Key West, Florida ($400-600)