The 1945 South African set overprinted BECHUANALAND for use in Bechuanaland. Similar set is overprinted for South West Africa, Basutoland and Swaziland http://www.philactica.co.nz/africa/bechuanaland/bechuanaland-1932-1966/7247 Collected as horizontal pairs in both languages.
Here is another. http://www.philactica.co.nz/africa/kenya,-uganda-tanganyika/kut-1935-1964-used/1493 Due to paper shortage the South Africa values were overprinted to serve demand in Kenya Uganda & Tanganyika. It was cheaper than printing new issues because of the war.
