Watch List notes:

Potosi, Bolivia, cob 8 reales, 1651 E, with crowned-P (Mastalir P1ca) countermark on cross, rare, Mastalir Plate. S-P36; KM-19b; Cal-1491. 20.50 grams. Broad but thin flan with surface corrosion and brownish toning, full but doubled shield with bold P-E to left and 8-E to right, full cross-and-tressure with countermark in very center, first and last 1's of date full, edge-crack. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 199 in Part A and page 202 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 original Herman Moro photo-certificate. From: Capitana, sunk in 1654 off Chanduy, Ecuador
($300-450)