Potosi, Bolivia, cob 8 reales, 1651E, Latin 5, with crowned-•F• (four dots) countermark on shield. S-P36; KM-19b; CT-511. 24.93 grams. Bold full countermark, full but doubled shield, full but weaker cross, good full crown, toned, corrosion on edge only. From the Maravillas Research Collection of Countermarked Potosi Cobs, with Marex certificate and tag #0328. Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island ($350-500)