Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip III, assayer M, Grade 2. S-P18; KM-9; Cal-771. 12.84 grams. Silvery but with only small areas of light corrosion, clear P-dot-M and REX (hence pre-dated type), also full denomination O-IIII, bold full cross, edge-split. With original Fisher tag and certificate 85A-188100, pedigreed to the J.P. Silberman Estate.Recovered from: Atocha, sunk in 1622 west of Key West, Florida.

Estimate: $800 - $1200