Watch List notes:

Potosi, Bolivia, cob 1 real, (1650-1) O, denomination-assayer I-O (no dot) punched over old denomination I to right, ex-Mastalir (Plate). S-P35; KM-12b. 3.81 grams. VF+ with choice, well-detailed shield and cross plus clear and rare over-denomination, darkly toned recessed areas. Pedigreed to the Robert Mastalir collection, plated on page 252 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.
($150-225)