Stylized Hercules columns, wavy lines below symbolizing the ocean. On top line initials of mint, face value and assayer. On center line `Plus Ultra` motto On lower line initial of assayer, year (2 digits) and mint
Reverse script
Latin
Reverse lettering
P I E
V SVL TA
56 P (Translation: Potosi (mint) I (Greek 1, for 1 Real) E (Assayer: Antonio de Ergueta) Plus Ultra (missing letters) (16)56 Potosi)