A unique coin struck on a rogue nail in a spectacular minting error has sold for more than $42,000.

Coin experts cannot be sure how the two inch long nail ended up in the US Mint production line but said it was one of the most unique and mysterious errors ever made.

Some of American president Franklin D Roosevelt's face can clearly be seen on one side, as well as the words 'In God We Trust', with a flaming torch on the other side.

No date has been stamped on the nail and nothing is known about when or how the odd item was made.

But it is believed the coin was struck in about 2000 or possibly a few years earlier as it appeared in the coin collecting community shortly after this.

Some people have suggested it was made on purpose by a rogue Mint employee.

The US Mint have made errors in the past and it is believed there are about six examples of coins struck onto nails - another dime nail and four Lincoln penny nails.

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Dime that's worth a mint! Rogue nail which was accidentally turned into a coin sells for $42,000(www.dailymail.co.uk/news/article-3406355/Dime-s-worth-mint-Rogue-nail-accidentally-turned-coin-sells-42-000.html)