Potosi, Bolivia, cob 1/2 real, 1675.S-P37b; KM-22; Cal-165.1.33 grams.Two dates, both in four digits (which is rare), the (bold) cross and monogram both full, also bold full mintmark, only light corrosion, nicely toned.With ROBCAR photo-certificate #M20195.Recovered from: Consolacion, sunk in 1681 off Santa Clara Island, Ecuador
Estimate: 70-100 USD