Coins were introduced in 1937 in denominations of 1, 5, 10, 25 centavos and ½ pesos with limited numbers of 1 peso coins first minted in 1939.
After 1963 the Peso Oro became a fiat currency and base metals replaced silver in the higher denominations, with the 10, and 25 centavos and ½ pesos reintroduced in copper-nickel in 1967. 1 peso coins were struck as only commemorative in small numbers.