Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip III, assayer T, Grade 3. S-P21; KM-9. 11.86 grams. Full but corroded shield with bold assayer T, good full cross (some weak spots), silvery surfaces, tag and certificate say "reversal on reverse" in error. With Fisher tag and photo-certificate #96A-14158. Recovered from: Atocha, sunk in 1622 west of Key West, Florida

Estimate: $300-450