Bolivia, Philip IV,-Reales, 1650, Potosi, assayer O, 25.2 g., similar to preceding but mint letter, assayer and denomination unclear and stamped with type Z countermark on reverse (Cal. 1032 var.; CN. --; CT. 426 var.), irregular shape, striking crack and some encrustation, fine, countermark good fine with some encrustation, extremely rare, only two examples of this type have been found