The flag used by SADCC between 1980 and 1992 comprised a plain white field with the SADCC logo in black in the centre.
Originally known as the Southern African Development Coordination Conference (SADCC), the Organisation was formed in Lusaka, Zambia, on April 1, 1980, following the adoption of the Lusaka Declaration - Southern Africa: Towards Economic Liberation by the nine founding member states.
The Declaration and Treaty establishing the Southern African Development Community (SADC), which has replaced the Coordination Conference, was signed on August 17, 1992 in Windhoek, Namibia.
Member States are Angola, Botswana, Democratic Republic of Congo, Lesotho, Malawi, Mauritius, Mozambique, Namibia, Seychelles, South Africa, Swaziland, Tanzania, Zambia and Zimbabwe.
On the site there is an animated flag: a blue field with a green circle in the center; on the green circle is a yellow letter-like thing; I can't figure out what it is. Perhaps someone can view it properly? There is also an emblem, which is quite boring.