ARGENTINA. Rio de la Plata. 8 Reales, 1815-PTS F. Potosi Mint. PCGS MS-63 Gold Shield. KM-14. Incredibly enticing and choice, this lustrous and brilliant example presents tremendous eye appeal. A few light marks are noted, but are wholly consistent for the grade assigned. Just two have been graded finer in the PCGS census. PCGS MS-63 Gold Shield.