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The Belgian franc was the currency of the Kingdom of Belgium from 1832 until 2002, when the euro was introduced. The Belgian mint was innovative, and in 1860, the country became the first to introduce coins made of cupronickel. A few years later, in 1865, Belgium formed the Latin Monetary Union with France, Switzerland and Italy (Greece joined the system later), which facilitated trade between the countries by setting standards by which gold and silver currency could be minted and exchanged.
This 40-franc gold coin was minted in 1835, and depicts Leopold I, the first king of the Belgians following the country's independence in 1830, on the obverse. The coin is now part of the National Numismatic Collection at the Smithsonian Institution's National Museum of American History.Coin design credit: Kingdom of Belgium; photographed by the National Numismatic Collection