Postage stamps and postal history of Mexico The regency had previously changed the official currency under which one peso equaled 8 reales to a decimal system in which one peso equaled 100 centavos. In making the conversion postal rates were rounded up, for example, the rate of one real being equal to 12.5 centavos was rounded up to 13 centavos. The stamps, as a result, were issued in values of 7c, 13c, 25c, and 50c. These stamps were issued with the year and invoice number and with or without the district name, but some issued in exchange for Eagle stamps were issued only with the Mexico City
Global silver trade from the 16th to 18th centuries to coins in the early period of the Ming Dynasty. The Ming paper currency eventually failed due to self-imposed inflation along with an inability to stop the production of counterfeit bills. The Ming attempted to produce copper coins as a new form of currency, but production was inconsistent. Hence silver became of high value because it was a valid currency that could be processed abroad. The bimetallic ratio of silver to gold was about two to one, which meant that European and Japanese merchants made a large amount of profit. In the 1640s, the bimetallic ratios in China converged with