Watch List notes:

Potosi, Bolivia, cob 2 reales, 1650 O, assayer as undotted O, ex-Mastalir (Plate Coin). S-P35; KM-14b; Cal-912. 3.67 grams. Choice example if a bit thin from corrosion, with full date and clear shield, cross, and assayer, natural edge-crack as made, dark gray-toned fields. Pedigreed to the Robert Mastalir collection, plated on page 249 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
($150-225)