Watch List notes:

Potosi, Bolivia, cob 8 reales, 165(?)E. S-P37a; KM-21. 22.30 grams. Full pillars and waves peeking through sheen of dark-brown encrustation (uncleaned), moderate corrosion. With original certificate from the salvagers. San Miguel el Arcangel ("Jupiter wreck"), sunk in 1659 off the east coast of Florida

Estimate: $200-300