|George I 5 drachma 1874|
|Leopold II 5 francs 1868|
|Napoleon III 5 francs 1868|
|Vittorio Emanuele II 5 lire 1874|
In 1865, France, Belgium, Italy, and Switzerland (from 1868 Greece and from 1889 Romania, also Spain, Austria, Bulgaria, Venezuela, Serbia, Montenegro, San Marino and the Papal State joined the union) agreed to change their national currencies to a standard and make them freely interchangeable.