Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip III, assayer R (curved leg), Grade 1. S-P15; KM-9; CT-244. 11.58 grams. Good full shield and cross with light corrosion in places and on edge, typically silvery. With original Fisher photo-certificate #137308. Recovered from: Santa Margarita, sunk in 1622 west of Key West, Florida

Estimate: $350