The one-peso coin, issued on September 1, 1994, is the only one of the series that is composed by two different alloys.
 

Obverse Design

Core:
Replica of the obverse of the first national coin, with the inscription “EN UNIÓN Y LIBERTAD” (“in union and liberty”); the mark of the Potosí mint, consisting of the superimposition of the letters “P,” “T” and “S;” the letter “J” for assayer José Antonio de la Sierra, who supervised the minting process; the inscription “8S” (“8 scutum”) for the coin denomination; and “1813,” the year of minting.

Outer ring:
The inscriptions “REPÚBLICA ARGENTINA” (“Argentine Republic”) and “PRIMERA MONEDA PATRIA” (“first national coin”).

Reverse Design Core:
Replica of the reverse of the first national coin, with the 32-rayed National Sun surrounded by the inscription “PROVINCIAS DEL RÍO DE LA PLATA” (“River Plate provinces”).

Outer ring:
The denomination in letters, the year of minting and two laurel branches at both sides.

WEIGHT 6.35 g
DIAMETER 23 mm (17-mm core)
THICKNESS 2.2 mm
COMPOSITION

92% Cu - 6% Al - 2% Ni (core)
75% Cu - 25% Ni (ring)