Obverse: Value (80) surrounded by four clovers and four rosettes. All within wreath.
Legend: PETRUS I DG CONST IMP ET PER P BRAS DEF * 1827 R *
Reverse: Crowned Brazilian shield inside wreath. Latin motto around.
Legend: IN HOC SIGNOI VINCES ("In this sign thou shalt conquer.")
Mint Mark: "R" (Rio de Janeiro), KM-366.1.
Weight: 29.04 gm, diameter: 39 mm