Potosi, Bolivia, cob 8 reales, (16)18T, Grade 3. S-P21. 20.76 grams. Full and well-detailed shield and cross despite surface corrosion and edge loss, full but weak 18 of date. With Fisher certificate #210170 (does not mention coin date). Recovered from: Atocha, sunk in 1622 west of Key West, Florida (Estimate: $250 - 375)