Potosi, Bolivia, cob 8 reales, (1651)E/O, with crowned-? countermark on shield. S-P36; KM-19b; CT-512. 26.34 grams. Solid and uncorroded, with partial countermark but full shield and cross, clear over-assayer, toned fields, flat peripheries, tiny edge-split. From the Maravillas Research Collection of Countermarked Potosi Cobs, with Marex certificate and tag #0490. Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island ($300-450)