Watch List notes:

Potosi, Bolivia, cob 8 reales, (1650) O, with uncommon crown-alone (Mastalir K1b) countermark on cross, rare, ex-Christie's, Mastalir Plate. S-P35; KM-19b; Cal-1488. 25.47 grams. Fairly solid coin (minimal corrosion on edge only) with clear P-O and 8-O flanking full shield, full cross (slightly doubled) with impressively large countermark in center, toned in crevices, desirable auction pedigree. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 241 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), and pedigreed to the original Christie's Maravillas auction of May 1992 (lot 35). From: Maravillas, sunk in 1656 off Grand Bahama Island
($300-450)