Postage stamps and postal history of Costa Rica change in currency from "Reales" to the new Pesos and "Centavos", the issue of 1863 was surcharged with new values for postal use: 1 Centavos, 2 Centavos, 5 Centavos (all over the Medio Real stamp), 10 Centavos (over Dos Reales) and 20 Centavos (over Cuatro Reales). The 5, 10 and 20 Centavos were also surcharged "U.P.U." Costa Rican stamps were issued overprinted "Guanacaste" in 1885-89 following war with Nicaragua over the sovereignty of Guanacaste. The first issue in the new "Colón" currency was dated 1900 and put into circulation in 1901. It consists of ten stamps with values ranging from
History of Chinese currency further reform was instituted in August 1948 in response to hyperinflation. The Gold Yuan Certificate replaced the fabi at the rate of 1 gold yuan = 3 million yuan fabi = US$0.25. The gold yuan was nominally set at 0.22217 g of gold. However, the currency was never actually backed by gold and hyperinflation continued. Finally, in 1949, the Kuomintang again announced a reform with the introduction of the Silver Yuan Certificate, returning China to the silver standard. The silver yuan would be exchanged at 1 silver yuan = 100 million gold yuan, and was backed by silver dollars minted