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N7aOJ TIL about the Belga, Belgium's parallel currency unit worth 5 Belgian Francs, introduced in 1927 to prevent confusion with the French Franc following the dissolution of the Latin Economic Union and the end of Napoleon III's monetary union.
1aByW TIL that banknotes were invented by Chinese in the 6th century for replacing coins as burial money. They started using it as currency in 812. The oldest conserved banknote is called "Kuan", made of mulberry tree bark, and dates from 1375.