Watch List notes:

Potosi, Bolivia, cob 2 reales, (1649) O/TR, dotted O, very rare, ex-Mastalir. S-P35; KM-unl; Cal-unl. 7.18 grams. Full but somewhat messy assayer with clear R-shaped under-letter (presumably TR monogram), full cross and most of shield despite extensive flatness, slightly crude edge (as made), bold full 16 of date, VF for actual wear with contrasting dark sediment in crevices. Pedigreed to the Robert Mastalir Collection and plated on page 243 of Part A of his book The Great Transition at the Potosi Mint, 1649-1652: The 1649-1652 Crowned Shield Coinage and the Countermarks of 1652 (2021).

Estimate: $200 - $300