Watch List notes:

Potosi, Bolivia, cob 4 reales, 1620T, Grade 1. S-P21; KM-9; CT-248. 13.24 grams. Bold full cross and shield (the latter slightly doubled), full P+T, bold 2 (z) of date with clear left side of final digit 0 (not mentioned on certificate), no corrosion, minor edge-crack. Pedigreed to the Classics collection, with Fisher tag and certificate #200387. Recovered from: Atocha, sunk in 1622 west of Key West, Florida

Estimate: $750-1100