Watch List notes:

Potosi, Bolivia, cob 8 reales, 1649 O, with three countermarks (very rare): crown alone on shield, crowned-O on cross, and arms on cross; ex-Mastalir (Plate). S-P35; KM-19b; Cal-1487. 19.75 grams. Broad flan but thin from corrosion (toned in crevices), still with full shield and crown and cross, also bold full assayer and king's ordinal (the date also clear), but most important feature is the presence of THREE prominent countermarks, including a nearly full crown-alone countermark on the shield (common type), a partial crowned-O countermark on the cross and a partial arms countermark near the edge on the reverse, one of very few examples known to have visited three different cajas reales for validation in its brief time (no more than five years) in circulation. Pedigreed to the Robert Mastalir Collection and plated on pages 59, 186 and 273 of Part B of his book The Great Transition at the Potosi Mint, 1649-1652: The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 (2021), with copy of Moro certificate countersigned by Daniel Frank Sedwick.Recovered from: Capitana, sunk in 1654 off Chanduy, Ecuador.

Estimate: $1000 - $1500