Reading the mint mark
The mint letter on a sovereign is tiny, yet it makes all the difference. Take a magnifier and start with the reverse. If you see the horseman, the letter is on the strip of ground under the horse, just above the date: S for Sydney, M for Melbourne, P for Perth, C for Ottawa, I for Bombay, SA for Pretoria. If you see a shield, it is below the laurel wreath. Some Australian Saint George coins of Victoria carry it elsewhere, under the bust on the portrait side.
No letter means London. That is the most frequent case, but not always the least interesting: 1819 and 1917 are difficult London dates. Conversely, a distant mint guarantees nothing: Perth and Pretoria produced millions of ordinary coins. Mint letters work the same way on French coins (A for Paris, BB for Strasbourg), as you will see on the 20 francs Napoleon III page.
Successive portraits: dating a worn coin
When the date has worn away, the effigy is often enough to place the coin. George III appears on the very first years, then George IV, first with a laureate head and later bareheaded. William IV (1830-1837) has a bare head modelled after Chantrey, always with the shield and the word “ANNO” before the date. Victoria first appears as a young woman with her hair tied up, then with a small crown and veil for the 1887 Jubilee, and finally as the veiled old queen from 1893.
In the 20th century, Edward VII (1902-1910) and George V (1911-1932) are bearded and bareheaded: these are the most heavily produced sovereigns. Elizabeth II can be recognised by her five successive effigies, from Mary Gillick's young laureate queen (1957) to Jody Clark's diademed portrait. Charles III, in left profile, is signed by Martin Jennings.
The reverse helps too: a Saint George with a London date between 1826 and 1870 does not exist. A coin combining the two needs a close look.
Period coin or counterfeit?
Few gold coins have been copied as often as this one. Long after it left everyday British use, it remained in demand in Greece and the Middle East. Forgers therefore worked in Syria, Italy, Switzerland and then Lebanon in the early 1970s, often with gold of the correct fineness. A coin of the right weight is not necessarily genuine. The Royal Mint restarted production in 1957 partly to counter these imitations.
Useful clues: blurred or doughy relief, a pitted surface that betrays casting, uneven edge reeding and, above all, a date that does not match the portrait or the mint (a George V dated 1935, a letter I on any year other than 1918). If in doubt, have the coin examined by a numismatist rather than testing it yourself with acid; you can request a coin identification.
Not to be confused with
The half sovereign uses the same designs on a smaller 19.30 mm blank with half the gold; its rare dates are its own. The guinea, which came before it until the early 19th century, is heavier and has a different reverse. Modern proof sovereigns, sold cased, have a mirror field and should not be mixed up with standard coins.
Also British, the modern Britannia is a one-ounce gold coin, far larger than a sovereign. Like the Krugerrand, it belongs to the family of modern bullion ounces. Finally, visitors used to continental coins sometimes confuse the sovereign with the 20 francs Napoleon or other Latin Monetary Union 20 francs: similar diameters, but 900‰ gold, a weight of 6.45 g and legends in French, Italian or Greek.
Wear on the horseman and the effigy
Saint George quickly reveals time spent in circulation. Start with the helmet and the mane, then the rider's leg and the horse's shoulder: these reliefs flatten first. The dragon's scales and curled tail fade next. On the shield, check the pearls of the crown and the veins of the laurel leaves.
On the effigy side, look for the high points of each reign: beard and ear for George V, cheekbone and the hair above the ear for Edward VII, ribbon and bun for young Victoria.
Many sovereigns ended up as pendants or bracelets. Solder, a loop mark and polishing lines are common. They matter little on a common date and a great deal on a rare one. Do not try to make the coin shine: cleaning leaves marks that cannot be undone.