Watch List notes:

Potosi, Bolivia, cob 4 reales, 1650 O, no countermark (rare), Mastalir Plate. S-P35; KM-17b; Cal-1106. 13.35 grams. Solid and virtually uncorroded, with high-grade details in the full cross and shield (the latter off-center and both slightly doubled), very bottoms of 650 of date visible, one of just two known with dots above but not below the P-O and 4-O flanking the shield. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 115 in Part A and page 409 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
($350-500)