Potosi, Bolivia, cob 4 reales, 1673E.S-P37b; KM-25; Cal-517.8.81 grams.Corroded but with solid centers showing two full pillars and a partial cross, small edge crack, dark gray toning.With ROBCAR tag and photo-certificate #M007075.From: Consolacion, sunk in 1681 off Santa Clara Island, Ecuador
($150-225)