Potosi, Bolivia, cob 4 reales, 1751q/E, rare.S-P52; KM-39; Cal-unl.9.43 grams.Corroded yet solid coin with all three digits in pillars side date visible, clear overassayer (unlisted in Calico) next to a bold full cross, mottled dark toning.With original photo-certificate from Uruguay.From: Luz, sunk in 1752 off Montevideo, Uruguay
($150-225)