Error Coins

The Error Coins category showcases one of the most fascinating and unpredictable areas of modern numismatics, featuring coins that were misstruck, misaligned, or incorrectly manufactured during the minting process. These rare anomalies are created when something goes wrong during production at official mints, resulting in coins that escape quality control and enter circulation with unique and often highly collectible imperfections.

Unlike post-mint damage, true error coins originate during the striking process itself, making them genuine mint-made varieties rather than accidental wear or alteration. Because they are unintended and typically rare, error coins have become a popular niche among collectors seeking unusual, one-of-a-kind pieces.

Error coins can range from subtle variations to dramatic and highly visible minting mistakes, and their value is often influenced by rarity, type of error, and collector demand.

This category includes a full selection of Error Coins, covering modern UK circulation errors, Royal Mint misstrikes, commemorative coin anomalies, and rare collectible minting varieties.

This collection may include:

• Off-Centre Strike Coins
• Double Strike Error Coins
• Die Crack & Die Chip Varieties
• Misaligned / Rotated Die Errors
• Clipped Planchet Coins
• Wrong Planchet Strikes (incorrect metal blanks)
• Missing Design Elements (partial strikes)
• Bimetallic “Spillover” or Ring Errors on £2 Coins
• Undated or Misdated UK Coins (notably 20p errors)
• Mule Coins (incorrect obverse/reverse combinations)
• Royal Mint Production Anomalies & Experimental Strikes

Error coins are especially popular in modern UK collecting, where coins such as the 2008 undated 20p, certain £2 misprints, and other circulation errors have gained strong attention from collectors and the wider public due to their scarcity and unusual appearance.

While many error coins are low value, highly dramatic or well-documented examples can achieve significant premiums at auction, particularly when the error is clearly visible, verified, and scarce.

Certified error coins are also available in some cases, with third-party grading services such as PCGS and NGC authenticating and encapsulating genuine mint errors, adding further confidence and collectability.

Whether you are a new collector discovering minting anomalies or an advanced numismatist seeking rare varieties, Error Coins offer a unique opportunity to own coins that stand apart from standard production issues.

Browse our full selection of Error Coins below, including UK mint errors, Royal Mint misstrikes, certified error coins, and rare circulation anomalies.