The Union of South Africa came into being on 31st May 1910. Union coins from 1923-1960 are also referred to as the Sterling South African Series.
Coins of the Union of South Africa. From 1923 coins of the Union of South Africa were struck at the Royal Mint, Pretoria. In 1941, the Government of South Africa took over the mint. It was renamed the South African Mint, although it continued to produce coins based on British coinage for some years thereafter.