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
National Union of Gold, Silver and Allied Trades than 100 in 1930. It merged with the Society of Goldsmiths, Jewellers and Kindred Trades in 1969, pushing membership up to 250. The union's Irish members transferred to the Irish Transport and General Workers' Union in 1976, but membership of the union generally increased; by 1979, it had risen to 2,308. In 1981, NUGSAT into with the Technical, Administrative and Supervisory Section. National Union of Gold, Silver and Allied Trades The National Union of Gold, Silver and Allied Trades (NUGSAT) was a trade union in Britain and Ireland. It represented workers in precious metals, jewellers, diamond polishers, electroplaters, watch and