^Lot 557 Potosi, Bolivia, cob 8 reales, (1650) O, with crowned-F (Mastalir Fa2-x) countermark on cross, rare.

Potosi, Bolivia, cob 8 reales, (1650) O, with crowned-F (Mastalir Fa2-x) countermark on cross, rare. S-P35; KM-19b; Cal-1488. 28.12 grams. Oblong flan with full but partially weak shield and cross, full 8-O to right and most of crown above, top half of countermark clear on cross (normally seen on shield side), rare as non-salvage, attractively toned Fine. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 343 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).