When Cuba became an independent republic in 1902, Switzerland immediately recognised it and established diplomatic and consular relations. The first Swiss honorary consuls were appointed in the 19th century. A consulate was established in 1918 and eventually became an embassy in 1957.
Trade began in the 19th century and was maintained after the revolution of 1959.
Switzerland represented the interests of the United States in Cuba from 1961 until the two countries restored diplomatic relations in July 2015. It also represented Cuban interests in the United States from 1991 to July 2015.
Cuba, Historical Dictionary of Switzerland (de, fr, it):
Diplomatic Documents of Switzerland, Dodis