Watch List notes:

Potosi, Bolivia, cob 8 reales, Philip III, assayer not visible, Grade 4, mounted in gold-wire bezel with emerald. KM-10. 19.75 grams total. Decent cross despite moderate to heavy corrosion (the shield indiscernible), simple custom mounting with decent-sized (1 carat?) emerald with modern faceting. With Fisher certificate #228726. Recovered from: Atocha, sunk in 1622 west of Key West, Florida

Estimate: $175 - 250