Watch List notes:

Potosi, Bolivia, cob 8 reales, 1620T, retrograde mintmark, Grade 1. S-P21; KM-10; CT-136. 27.03 grams. Thick and uncorroded flan but with flat centers, bold mintmark "q" (retrograde P) above + and T, also full denomination O-VIII and full date. Pedigreed to the Classics collection, with Fisher tag and photo-certificate #96A-270299. Recovered from: Atocha, sunk in 1622 west of Key West, Florida

Estimate: $800-1200