Watch List notes:

Potosi, Bolivia, cob 4 reales, Philip III, assayer M, Grade 2, ex-Atocha (1622), mounted in twisted-wire sterling silver bezel with 14K gold prongs and bail and ship's helm embellishment at bottom. 18.44 grams total. Full but lightly corroded cross and shield. From the Atocha (1622), with Fisher certificate #159512.

Estimate: $500-750