Watch List notes:

Potosi, Bolivia, cob 8 reales, (1651-2) E, with crowned-T (Mastalir T1[ca]a) countermark on cross, rare, Mastalir Plate. S-P36; KM-19b; Cal-Type 327. 26.33 grams. Choice coin, uncorroded and beautifully toned, with nice full shield and cross, full P-E to left and most of 8-E to right, with 16 of date full (doubled) but lacking the last two digits, full upper half of countermark there as well, deemed by Mastalir to be a unique subtype. Pedigreed to the Roberto Mastalir Collection of Countermarked Potosi Cobs, Plate Coin (page 218 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). From: Maravillas, sunk in 1656 off Grand Bahama Island
($300-450)