Latvian rublis printed quite similar notes but with different signatures on them. This government recognized the previously printed banknotes as legal tender. The designer of these banknotes was Jūlijs Madernieks. On 3 August 1922, the Cabinet of Ministers approved the "Regulations on Money" which introduced the "lats" as Latvia's national currency. The lats was equal to 50 rubļi. The rublis remained in circulation alongside the lats for a time. Latvia's regained independence was recognized by the Soviet Union on 6 September 1991. In the first four months of 1992, the country was adversely affected by inflation of the Soviet ruble. In addition,
Currency mostly paper, but Australia's Commonwealth Scientific and Industrial Research Organisation developed the world's first polymer currency in the 1980s that went into circulation on the nation's bicentenary in 1988. Now used in some 22 countries (over 40 if counting commemorative issues), polymer currency dramatically improves the life span of banknotes and prevents counterfeiting. Currency use is based on the concept of lex monetae; that a sovereign state decides which currency it shall use. Currently, the International Organization for Standardization has introduced a three-letter system of codes (ISO 4217) to define currency (as opposed to simple names or currency signs), in