Potosi, Bolivia, cob 4 reales, 1653 E, PH at top, retrograde denomination 4. S-P37a; KM-18; Cal-1116. 8.07 grams. Somewhat corroded and a little smooth with thin edges yet fairly strong design elements visible, large natural edge-crack. From: Capitana, sunk in 1654 off Chanduy, Ecuador
($200-300)