Most people never notice a mint mark on a coin, a tiny letter or privy mark near the date that tells you which mint struck the piece. For collectors of George V and earlier British coins, mint marks are a major part of valuation. Here's what to look for.
UK mint marks, by era
1816–present: the Royal Mint (no mark)
Coins struck at the Royal Mint itself, first Tower Hill, later Llantrisant, carry no mint mark. This covers the vast majority of British coinage. The Royal Mint is the default producer; a privy mark only appears when another mint helped.
1874–1932: Heaton Mint, Birmingham (H)
During major coin shortages the Royal Mint contracted private mints to supplement capacity. The Heaton Mint (Ralph Heaton & Sons, later The Mint, Birmingham Ltd) was the most prolific, striking coins from 1874 through 1932. Its mint mark is a small "H" beneath the date on the reverse.
Key Heaton-struck dates for collectors:
- 1874 H, 1875 H, 1876 H pennies, Victoria Bun Head. Scarcer than London strikes. £20–£250 depending on grade.
- 1912 H, 1918 H, 1919 H pennies, George V. £15–£100.
- 1882 H bronze penny, a scarce date in any grade.
1918–1919: Kings Norton Metal Company (KN)
During WWI coinage shortages, Kings Norton Metal Company in Birmingham also struck British pennies. The mark is "KN" beneath the date.
- 1918 KN penny, scarcer than standard 1918. £20–£80.
- 1919 KN penny, same pattern. £15–£60.
Only 1918 and 1919 pennies carry the KN mark. Anything else claiming KN is misidentified or fake.
Dominion mints (for UK-linked coins)
Outside the UK itself, several Commonwealth mints also struck British-type coins:
- Ottawa, Canada (C), sovereigns 1908–1919
- Melbourne, Australia (M), sovereigns 1872–1931
- Sydney, Australia (S), sovereigns 1855–1926
- Perth, Australia (P), sovereigns 1899–1931
- Bombay, India (I), sovereigns 1918 only
- Pretoria, South Africa (SA), sovereigns 1923–1932
Rare dominion-mint sovereign combinations are worth significant premiums over common London strikes. A 1917 C Ottawa sovereign in high grade can reach £5,000+.
Where exactly to look
Mint marks on British coinage almost always appear on the reverse (tails side), usually:
- Beneath the date
- Just above the exergue line (the horizontal line near the bottom of the reverse)
- Occasionally within the design itself (e.g. hidden in the lace on Edward VII sovereigns)
You'll need a loupe (at least 5×, ideally 10×) to see them clearly on circulated coins. On heavily worn pieces the marks may be invisible.
Privy marks vs mint marks
Some modern issues (especially Jersey and Isle of Man territorial coins) use privy marks, small symbols like anchors, shields or animals rather than letters. These perform the same function: identifying the mint or issuing authority.
The Royal Mint's Llantrisant facility has occasionally used privy marks on commemorative pieces to distinguish variant issues, the 1996 Football European Championship £2 carries a small ball-and-flame motif.
Modern coins, why no marks?
From the 1960s onwards the Royal Mint handled all UK coinage in-house; contracted private minting ended. Modern UK circulating coins therefore carry no mint mark. The absence itself tells you: struck at the Royal Mint, Llantrisant.
For mint-mark-specific listings in our catalogue, use the filter on /coins.