Watch List notes:

Potosi, Bolivia, cob 8 reales, 1651E, with DOUBLE crowned-•F• (two dots) countermark on shield. S-P36; KM-19b; CT-511. 24.16 grams. Common countermark but never seen doubled like this, full date and king's ordinal IIII, nice full shield and cross-and-tressure, corrosion on edge only, with large crack, nicely toned. From the Maravillas Research Collection of Countermarked Potosi Cobs, with Marex certificate and tag #0085. Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island ($350-500)