Watch List notes:

Potosi, Bolivia, cob 8 reales, 1649 O, with crown-alone countermark (very rare variety) on cross, ex-Mastalir (Plate). S-P35; KM-19b; Cal-1487. 20.33 grams. Very broad flan (but thin from corrosion) with two edge-splits, much bold legend including king's name and ordinal and ANO 1649 date, also full and bold assayer, full shield and cross with bold and well-detailed countermark that is represented by only two known examples in 8R, toned in crevices. Pedigreed to the Robert Mastalir Collection and plated on page 58 of Part A and page 380 of Part B of his books The Great Transition at the Potosi Mint, 1649-1652: The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 (2021).Recovered from: Capitana, sunk in 1654 off Chanduy, Ecuador.

Estimate: $500 - $750