Watch List notes:

Potosi, Bolivia, cob 8 reales, 1651 E, with uncommon crown-alone (Mastalir K6d) countermark on cross, rare, Mastalir Plate. S-P36; KM-19b; Cal-1491. 23.99 grams. Fairly solid flan (only light surface corrosion), silvery, with full but weak shield and cross, the latter with nearly full countermark (sometimes referred to as a "jester's cap" crown), minor edge-splits. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 301 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)