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
Currency of Colombia to establish Banco Nacional, which began operations in January 1881. A decree of 24 March 1885 authorized coins of nickel and 0.500 silver, and authorized Banco Nacional to issue notes for 10 & 20 centavos. The cost of the civil war of 1885 was covered by paper money, circulation increasing by 89%. Banco Nacional was unable to cover its notes in gold coin, but the Government compromised on suspension by paying notes in silver with the funds received from negotiating the Panama Canal. "El Banco Nacional de los Estados Unidos de Colombia" was responsible for the national note issue 1880–1885.