Watch List notes:

Potosi, Bolivia, cob 1 real, 1651 O, assayer as undotted O, ex-Mastalir (Plate Coin). S-P35; KM-12b; Cal-745. 3.07 grams. Moderate corrosion yet solid with clear last digit of date, minor spots of encrustation on reverse. Pedigreed to the Robert Mastalir collection, plated on page 251 of his 2021 book The Great Transition at the Potosi Mint 1649-1652 / The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 / Part A: The 1649-1652 Crowned Shield Coinage. From: Capitana, sunk in 1654 off Chanduy, Ecuador
($100-150)