According to [1] this flag was designed by HC Blatt, assistant secretary in the Department of the Prime Minister in 1965, and was already approved by Prime Minister Henrik Verwoerd at the time of his assasination in 1966.
Legal disclaimer This image shows (or resembles) the flag of South Africa from 1928 until 1994. In South Africa, public display of this flag for purposes other than genuine artistic, academic or journalistic expression is considered to be prohibited hate speech in terms of the order of the Supreme Court of Appeal in the case Afriforum NPC v Nelson Mandela Foundation Trust and Others
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Captions
Proposal for the Flag of South Africa, 1965, the "Verwoerd Flag"