Economic ties between the two countries started to develop in the 1950s but they remained limited, mainly because of the internal conflicts.
The Swiss consulate in Luanda operated from 1962 to 1975, the year when Angola gained independence from Portugal. Switzerland recognised the People's Republic of Angola on 18 February 1976 and in 1977 opened an embassy in Luanda, headed by a chargé d'affaires. Between 1975 and 2002, regional conflicts and Angola's civil war forced Switzerland to close its embassy in August 1996 and replace it with a Swiss Humanitarian Aid office, first in Huambo and then in Luanda.
Angola, Historical Dictionary of Switzerland (de, fr, it)
Diplomatic documents of Switzerland, Dodis