Exact error to spot on ‘holy grail’ 20p which makes it 250 times MORE valuable – do you have one wedged down your sofa?

A RARE 20p coin has sold for 250 times its face value – so it might be time to check under your sofa.

The Britannia Coin Company of Royal Wootton Bassett dubbed the rare undated token the “holy grail of change collecting”.

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The rare 20p sold for 250 times its face value (stock image)[/caption]

A printing error in 2008 saw a limited number of 20p coins struck without a year.

The Royal Mint printed 136million 20p pieces with around 250,000 bearing the error.

One seller, from Uttoxeter, bagged £50 by selling the coin – making it 250 times worth its face value, the Wiltshire Times reports.

The buyer had to pay £5.60 for delivery as well.

The coin has previously gone for up to £70.

The Britannia Coin Company website says: “The issue occurred because an old obverse (‘heads’) design was used with the new royal shield of arms reverse, introduced in this year.

“The previous Tudor rose design had the date on either side of the crown. When this was replaced with the shield, the date was moved to the other side.

“It was moved on most 20ps but not these ones, which bear no date at all.

“These coins have been circulated, so they will show the signs of wear typical of change that has been in wallets and cash registers.

“The only difference is this unusual error.”

Alamy

A printing error in 2008 saw a limited number of 20p coins struck without a year[/caption]