Potosi, Bolivia, cob 4 reales, (164)9O, with crowned-L countermark on cross. S-P35; KM-17b; CT-731. 11.56 grams. Full countermark on full cross, nearly full shield, nicely toned, hairline edge-split, minimal surface corrosion. From the Maravillas Research Collection of Countermarked Potosi Cobs, with Marex certificate and tag #0426. Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island ($300-450)