Exact detail missing from 20p coin which makes it 300 times MORE valuable – as spare change sparks intense bidding war

A MINOR detail missing from your 20p coin could make it 300 times more valuable.

A manufacturing error by the Royal Mint in 2008 meant that only around 250,000 coins were printed with this unique error.

GettyThese valuable coins could be hiding in anyone’s wallet or purse[/caption] EBayThe two dateless coins sold for £122 after sparking a bidding war[/caption]

What makes these 20p coins so valuable is that they are undated.

This means they were the first undated...