Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip IV, assayer O, with crowned-? countermark on cross. S-P35; KM-17b. 7.35 grams. Dark and thin due to saltwater immersion, bold partial shield, some cross and countermark detail yet the full countermark obscured. Recovered from: Capitana, sunk in 1654 off Chanduy, Ecuador.

Estimate: $150 - $225