Watch List notes:

Potosi, Bolivia, cob 1 real, (1649) O, flattened O, rare, ex-Mastalir. S-P35; KM-12b; Cal-743. 2.73 grams. VF+ with no readily apparent corrosion beyond spots of dark encrustation, rare variety with flattened assayer O to left of the shield, nice cross if slightly off-center. Pedigreed to the Robert Mastalir Collection.Recovered from: Capitana, sunk in 1654 off Chanduy, Ecuador.

Estimate: $125 - $200