These two FDCs with two very expressive stamps were issued by the UN postal Services to commemorate the United Nations having assumed Direct Responsibility for Namibia.
The name of the country is derived from the Namib Desert, considered to be the oldest desert in the world. Before its independence in 1990, the area was known first as German South-West Africa (Deutsch-Südwestafrika), then as South-West Africa, reflecting the colonial occupation by the Germans and the South Africans (technically on behalf of the British crown reflecting South Africa's dominion status within the British Empire).
United Nations Commissioner for South-West Africa was a post created by the United Nations General Assembly (UNGA) in 1966 to assert the UN's direct responsibility for South-West Africa which was then under illegal occupation by apartheid South Africa. UNGA renamed the post United Nations Commissioner for Namibia in 1968.Namibia eventually achieved its independence from South Africa on 21st March 1990. Merja gave me thse nice covers.