Watch List notes:

Potosi, Bolivia, cob 8 reales, (1651-2) E, with pentagonal crowned-1652 (Mastalir P52) countermark on cross, rare, Mastalir Plate. S-P36; KM-19b; Cal-Type 327. 12.47 grams. Very thin from corrosion, dark and cracked, but with most of the pentagonal countermark visible, particularly the 1652 date. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 388 in Part B) in his book The Great Transition at the Potosi Mint, 1649-1653, The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 (2021), with Sedwick certificate from 2008. From: Maravillas, sunk in 1656 off Grand Bahama Island
($250-375)