^Lot 1646 Potosi, Bolivia, cob 8 reales, (1651-2) E, no countermark (rare), Mastalir plate.

Potosi, Bolivia, cob 8 reales, (1651-2) E, no countermark (rare), Mastalir plate. S-P36; KM-19b. 22.15 grams. Full and well-detailed shield and cross despite moderate corrosion, mostly silvery but with dark patch on shield, both assayers visible, thin edge-crack. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 452 in Part B) in his book The Great Transition at the Potosi Mint, 1649-1653, The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 (2021), with copy of Herman Moro certificate. Recovered from: Capitana, sunk in 1654 off Chanduy, Ecuador