Watch List notes:

Potosi, Bolivia, cob 4 reales, 1651E, with arms countermark on cross. S-P36; KM-17b; CT-unl. 11.75 grams. Broad flan with light corrosion only around edge, full cross with clear date and much of the countermark (which is always peripheral and incomplete), full P-E to left of partial shield, lightly toned. From the Maravillas Research Collection of Countermarked Potosi Cobs, with Marex certificate and tag #0427. Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island ($350-500)