Some new £1 coins - introduced into circulation last month as the "most secure coin in the world" - may be defective, the Royal Mint has admitted. It said that a "small number of coins" were affected when they were struck at a rapid rate during production.The Royal Mint is striking 1.5 billion new 12-sided £1 coins, introduced to help crack down on counterfeiting.Out of shape versions of the coin, considered collectors' items, are appearing on internet auction sites.

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