Potosi, Bolivia, cob 8 reales, (1651-2) E, with uncommon crown-alone (Mastalir K7) countermark on cross, very rare, Mastalir Plate. S-P36; KM-19b; Cal-Type 327. 27.10 grams. Very solid and full-weight coin with clear and nearly full countermark (one of only four known on 8R [three on cross side], according to Mastalir), full but partially flat cross and shield (the latter off-center), part of edge bent. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 306 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 tag and certificate. From: Capitana, sunk in 1654 off Chanduy, Ecuador
($350-500)