Potosi, Bolivia, cob 4 reales, 1679C.S-P38; KM-25; Cal-523.10.00 grams.Corroded all over but with old full and bold pillar and half of cross, two assayers, edge-split, toned.With ROBCAR tag and photo-certificate #2020236 (erroneously listed as a 2 reales).Recovered from: Potosi
Estimate: 125-200 USD