Watch List notes:

MEXICO, Mexico City, cob 4 reales, Philip II, assayer O below mintmark oM to right. S-M11; KM-36; Cal-506. 12.84 grams. Toned but with only localized light corrosion, full shield and cross-lions-castles, bold full oMO to right, hairline edge-split. With original certificate from the salvor/conservator. Recovered from: Santiago, sunk in 1585 off Bassas da India in the Indian Ocean

Estimate: $200 - $300