Mexican peso while all currency that only said "peso" was removed from circulation. The Bank of Mexico then issued new currency with new graphics, also under the "nuevo peso". These were followed in due course by the current, almost identical, "peso" currency without the word "nuevo". In 1993, coins of the new currency (dated 1992) were issued in denominations of 5, 10, 20 and 50 centavos, 1, 2, 5, 10, 20 and 50 nuevos pesos. The 5 and 10 centavos were minted in stainless steel and the 20 and 50 centavos in aluminium bronze. The nuevo peso denominations were bimetallic, with the
Gold standard to Congress the value of a decimal system. This system would also apply to monies in the United States. The question was what type of standard: gold, silver or both. The United States adopted a silver standard based on the Spanish milled dollar in 1785. From 1860 to 1871 various attempts to resurrect bi-metallic standards were made, including one based on the gold and silver franc; however, with the rapid influx of silver from new deposits, the expectation of scarce silver ended. The interaction between central banking and currency basis formed the primary source of monetary instability during this period.