Watch List notes:

Potosi, Bolivia, cob 8 reales, 1651 E, with P/8 to left and 8/P to right, crowned-T (Mastalir Ta) countermark on shield, very rare, Mastalir Plate. S-P36; KM-19b; Cal-1491. 23.73 grams. Good full shield and cross despite light corrosion, with clear P/8-E to left and 8/P-E to right (just three known with this error-correction), both 1's and part of 5 of date visible, also nearly full countermark at top of shield, toned all over. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 140 in Part A and page 315 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)