Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip II, assayer B (1st period). S-P4; KM-4.2. 12.06 grams. Lightly corroded (salvaged) but lustrous and with near-AU details, broad flan, full and well-detailed shield and cross. Probably from the ca.-1590 "Yucatan wreck." (Estimate: $90 - 135)