Original: Peso Oro, from 1937 Coins were introduced in 1937 in denominations of 1, 5, 10, 25 centavos and ½ pesos with small numbers of 1 peso coins first minted in 1939.
Simplified: Coins were introduced in 1937 in denominations of 1, 5, 10, 25 and 50 centavos.