The Munich Coinage Treaty (German: Münchner Münzvertrag) of 1837 was a treaty between six southern German states who agreed to form the South German Coinage Union (Süddeutsche Münzverein) and to unify their currencies together with some of the central German states. [1] The Munich Coinage Treaty was updated by the South German Coinage Convention of 1845. The agreement is less commonly known as the Munich Coin Treaty.