Watch List notes:

Potosi, Bolivia, cob 4 reales, (1650-1) O, with arms countermark on cross. S-P35; KM-17b. 12.77 grams. Attractively toned (and atypically non-salvage) VF+ with full cross, full upper half of shield, about 1/3 of the countermark (more than usually visible), peripherally flat.

Estimate: $300 - $450