Potosi, Bolivia, cob 8 reales, 1639 TR, rare. S-P27; KM-19a; Cal-1466. 23.93 grams. Bold full 39 of date and clear P-dot-TR-dot, most of shield and cross (slightly off-center strike), non-toned Fine with lightly oxidized surfaces.
Estimate: 350 - 500 USD