Watch List notes:

Potosi, Bolivia, cob 8 reales, (1650-1)O, with unidentified crowned-letter countermark on cross (probably rare). S-P35; KM-19b. 23.49 grams. Full shield and cross on oblong flan with corrosion on edge and some surfaces, small edge-split, lightly toned, with intriguing countermark that shows the typical crown above a letter (unreadable) inside a border of dots WITHOUT inner ring (hence not a match with any of the usual crowned-letter marks). From the Maravillas Research Collection of Countermarked Potosi Cobs, with Marex certificate and tag #0441. Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island ($250-375)