Watch List notes:

Potosi, Bolivia, cob 8 reales, (1651-2) E, with uncommon crown-alone (Mastalir K2) countermark on cross, rare, Mastalir Plate. S-P36; KM-19b; Cal-Type 327. 19.66 grams. Thin from corrosion but with good full shield and cross, bold king's ordinal IIII, choice and nearly full countermark (fancy, elegant crown), toned in crevices. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 248 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 original Herman Moro certificate. From: Capitana, sunk in 1654 off Chanduy, Ecuador
($300-450)