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Image Source. The most disturbing of the ancient currencies may be dolphin teeth, which were used in the Solomon Islands for hundreds of years, in keeping with timeworn traditions. In 2008 the islandâs dollar currency became devalued.
Highest banknote: 100 (in Scotland and Northern Ireland) and 50 (in England and Wales) The pound sterling is the world's oldest currency still in use and it is the fourth most traded currency in the foreign exchange market, after the United States dollar, the euro, and the Japanese yen.