Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip III, assayer M, Grade 2. S-P18; KM-9; Cal-771. 11.27 grams. Nearly full shield and cross with clear REX in legend where date would appear in later issues, light surface corrosion, cracked flan (as made). With Fisher tag and certificate 191733. From: Atocha, sunk in 1622 west of Key West, Florida
($500-750)