Potosi, Bolivia, cob 1/2 real, 1671.S-P37b; KM-22; Cal-161.1.64 grams.Bold full cross, clear monogram and date despite corrosion, nicely toned.With ROBCAR tag and photo-certificate #2019115.Recovered from: Consolacion, sunk in 1681 off Santa Clara Island, Ecuador
Estimate: 60-90 USD