Watch List notes:

Potosi, Bolivia, cob 8 reales, (1649) O/Z/T (unique), early castles, rotated reverse legend, with crowned-L countermark on shield (very rare thus), ex-Mastalir (Plate). S-P35; KM-unl; Cal-unl. 26.06 grams. Bold full assayer O with clear diagonal of the Z and faint but certain vertical of the T inside (not mentioned by Mastalir in his books), somewhat confirmed by the early-style castles and dark brassy color indicative of debased silver, very bold full countermark near middle of full shield (one of only seventeen 8R known with this countermark on the obverse), full but somewhat flat cross, crude thick flan with much flatness but no corrosion, edge-split. Pedigreed to the Robert Mastalir Collection and plated on page 116 of Part B of his book The Great Transition at the Potosi Mint, 1649-1652: The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 (2021), with photo-certificate.Recovered from: Maravillas, sunk in 1656 off Grand Bahama Island.

Estimate: $500 - $1000