Watch List notes:

Potosi, Bolivia, cob 8 reales, (1649) O/sR (rare), early castles, rotated reverse legend, with crowned-O countermark on cross, ex-Hudson, ex-Mastalir (Plate). S-P35; KM-19b; Cal-unl. 23.30 grams. Broad round flan with some flatness and corrosion but technically full shield and cross, fairly clear O/sR assayer (misattributed to O/Z in the Hudson Collection), date not visible but with enough reverse legend to see the rotation, very weak countermark, toned in crevices. Note that the castles resemble much earlier issues, this coin being the only one of O/sR known with that feature, according to Mastalir. (See lot 205 for explanation of this over-assayer.) Pedigreed to the Louis Hudson Collection (Sedwick Auction 6, lot 294) and to the Robert Mastalir Collection, plated on page 46 of Part A and page 177 of Part B of his books The Great Transition at the Potosi Mint, 1649-1652: The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 (2021).Recovered from: Capitana, sunk in 1654 off Chanduy, Ecuador.

Estimate: $300 - $450