Potosi, Bolivia, cob 4 reales, 1739M. S-P47; KM-30a; CT-1122. 10.05 grams. Full pillars-and-waves (one pillar bold) and cross, two dates and assayers and mintmarks, moderate corrosion, dark toning. Recovered from: Luz, sunk in 1752 off Montevideo, Uruguay ($200-300)