The rare undated 20p coin dubbed 'the holy grail of change collecting' after a printing mishap in 2008

Only a limited amount of 20p pieces were struck without a year in November 2008 after the printing error.

A rare undated 20p coin has sold on eBay for a staggering £50 - making it 250 times more valuable than its face worth.

The coin, which was struck without a year in 2008, is now being dubbed "the holy grail of change collecting" by The Britannia Coin Company of Royal Wootton Bassett.

Only a small number of the 20p pieces were struck without a year in November 2008 after the printing mishap.

The Royal Mint had 136 million Twenty Pence printed that year and only about 250,000 coins are thought to have been minted with this unique error.

The seller from Uttoxeter is sure to be over the moon after shifting the coin for a massive profit.

The coin sold for £50 plus £5.60 postage on eBay - making it a total bargain for the buyer.

It has previously sold for £61 and £70.

The Britannia Coin Company of Royal Wootton Bassett, a coin-selling website, sells their 20p coins for £90.

The website explains how the error occurred, stating: "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."

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