Mark (currency) Germany was reunified in 1990. The German mark was replaced by the euro, first as an accounting currency on 1 January 1999, at a conversion rate of 1.95583 marks per euro. Thereafter, the mark-denominated notes and coins represented the euro at that conversion rate, and remained legal tender until 1 January 2002, when they were replaced by euro notes and coins. Germany mints its own German euro coins, but all euro coins are legal tender throughout the Eurozone. The remaining Convertible mark of Bosnia-Herzegovina is a currency that officially replaced the German mark as de facto currency of the ruptured
World currency unit The WCU – World Currency Unit (WCU) is an indexed unit of account that stands for a unit of real global purchasing power. Since each unit by design represents a stable unit of purchasing power, the stipulated interest rate on WCU-denominated bonds represents a real interest rate. In principle, the common denomination of bonds by issuers from different parts of the world using the WCU, as well as the greater transparency of real interest rates, will produce more efficient capital markets, as savers and borrowers around the world converge in their understanding of what each basis point of interest means