Watch List notes:

Potosi, Bolivia, cob 8 reales, 1650 O, with crowned-L (Mastalir Laa) countermark on cross, Mastalir Plate. S-P35; KM-19b; Cal-1488. 17.86 grams. Full date with modern 5 and dots in between digits and single dots to left and right (unique subtype), well-detailed full shield and cross (fine style, probably Royal dies according to Mastalir), bold full countermark, thin from corrosion, toned all over. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 108 in Part A) 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
($350-500)