Union gold — the Pretoria sovereigns

When people say “Union gold,” they usually mean this: the George V sovereign struck in Pretoria between 1923 and 1932, identical to the London coin in all but one detail. It was the last branch the Royal Mint ever opened, and the last to strike sovereigns of any kind. For the date-collector it offers one of the great chases in the series — a first year so scarce it is counted in hundreds, sitting in the same set as years counted in millions.

The last branch mint

Gold found at Langlaagte on the Witwatersrand in 1886 turned South Africa into the largest gold producer on earth. The logic of the branch mints had always been to strike sovereigns close to the gold, and under the Mint Act of 1919 the Royal Mint opened a Pretoria branch on 1 January 1923. It was the sixth and final overseas branch, after Sydney, Melbourne, Perth, Ottawa and Bombay. The first South African sovereign was not struck until later that year.

The coins were legal tender at the same value as the British sovereign — one pound, twenty shillings — and were struck to the identical standard set for the modern sovereign in 1817. In total the Pretoria branch produced 83,442,397 sovereigns across its ten years. In 1941 it cut its ties with London, closing on 30 June and reopening as the South African Mint — the institution that would later give the world the Krugerrand.

Reading the coin

The obverse carries Bertram Mackennal’s bare-head portrait of George V; the reverse is Benedetto Pistrucci’s St George on horseback slaying the dragon, the design that has run on the sovereign since 1817. The only mark of its origin is a minuscule SA on the ground line below the horse, just above the date — so small it is best read under a loupe.

There are two portraits across the run. The large bare head appears from 1923 to 1928; a smaller bare head takes over from 1929 to 1932. Specification never changed: 22-carat gold (.9167 fine), 7.99 g, 0.2354 oz of fine gold, in the standard 22.05 mm sovereign format.

The mintage run

The official figures tell the story of a mint finding its feet, then running flat out. Two years of a few hundred to a few thousand coins are followed by a steep climb to a single enormous peak in 1928, before the gold-standard crisis closes the series in 1932.

The 1923 and 1924 rarities

Mintage alone understates how hard the early dates are to find, because a great many South African sovereigns were melted over the decades — so survival is not proportional to the figures struck. The two key years are 1923 and 1924. The 1923 is the prize: sources differ on the exact number — Marsh gives 460, Krause records 64 currency strikes plus 655 proofs, and figures around 584 are also cited — but all agree it is one of the most sought-after dates in the entire sovereign series. The 1924, at 2,660, is the second rarest. Both the proof and currency 1923 are serious rarities; the rest of the run, by contrast, survives in quantity and trades close to its gold content.

The half sovereign

Pretoria also struck the smaller denomination. South African half sovereigns — the George V design at half the size, 3.99 g and 0.1177 oz of fine gold — were produced in only a handful of years (1923, 1925 and 1926) and in far smaller numbers than the full coin. They are correspondingly harder to find and are a quieter, often-overlooked corner of the Union gold story.

Why it matters

The Union sovereign is the bridge between two worlds of South African gold: the imperial sovereign struck for a dominion of the British Empire, and the home-grown Krugerrand that would follow from the same Pretoria site three decades later. For the collector it is approachable at the common dates and genuinely formidable at the rare ones — a complete date set is a real achievement, anchored by a first year that almost never appears. It is, quite simply, the heart of Union gold.