Watch List notes:

Potosi, Bolivia, cob 8 reales, 1651(O or E), with crown-alone countermark (rare variety) on cross. KM-19b. 15.10 grams. Bold date and nearly full countermark on uncorroded cross side, the shield side heavily corroded, making the coin thin. With Marex tag #91-8R-0954. Maravillas, sunk in 1656 off Grand Bahama Island

Estimate: $400-600