Watch List notes:

Potosi, Bolivia, cob 4 reales, (1618)T, denomination retrograde o-4, rare, Grade 1. S-P21; KM-9; CT-247. 13.16 grams. Broad flan with full king's name in legend outside of clear denomination (a variety known for 1618 only). PxT on other side of full shield, the cross also full and with partial date, silvery but uncorroded, inexplicably described as "period counterfeit" on the certificate. Pedigreed to the Classics collection, with Fisher tag and photo-certificate #271015. Recovered from: Atocha, sunk in 1622 west of Key West, Florida

Estimate: $750-1100