Input (grade 12): Coins were introduced in 1937 in denominations of 1, 5, 10, 25 centavos and Â 1\/2 pesos with small numbers of 1 peso coins first minted in 1939.
Output (grade 8): Coins were introduced in 1937 in denominations of 1, 5, 10, 25 and 50 centavos.