Watch List notes:

Potosi, Bolivia, cob 8 reales, 1651O, with TWO crowned-C countermarks (VERY rare) on cross. S-P35; KM-19b; CT-510. 26.83 grams. Broad and uncorroded flan with much legend (including bold 51 of date) around full inner details (two clear assayers), both countermarks nearly full. With Marex tag #91-8R-0125. Maravillas, sunk in 1656 off Grand Bahama Island

Estimate: $600-900