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The reverse design is inspired by a well-known First World War poster featuring Field Marshal Lord Kitchener, with the words 'YOUR COUNTRY NEEDS YOU' and 'THE FIRST WORLD WAR 1914-1918' above and the date below.
The obverse of this £2 shows a portrait of Queen Elizabeth II with the inscription 'ELIZABETH · II · DEI · GRA · REG · FID · DEF ·' around. The words 'TWO POUNDS' should appear below the bust, but are missing on this error coin.
The error on this coin is caused by an incorrect pair of obverse and reverse dies being used in the minting process. Just like a mule - the offspring of a horse and a donkey - error coins like these have mismatched 'parents'.
Coin experts think that Lord Kitchener error £2s were struck using the obverse design intended for the Trinity House £2, which does not show the denomination on the obverse. It's a subtle mistake, and it's easy to see how it happened.
It's unknown exactly how many of these error coins were released into circulation, but a handful have come to light in the last few years. The Royal Mint Museum has previously confirmed the error in letters to individual collectors.
