Potosi, Bolivia, cob 1/2 real, 1675.S-P37b; KM-22; Cal-165.1.40 grams.Most of monogram and cross bold, the former with clear four-digit date below, lightly corroded, nicely toned.With ROBCAR tag and photo-certificate #2020241.Recovered from: Consolacion, sunk in 1681 off Santa Clara Island, Ecuador
Estimate: 60-90 USD