A rare 20p coin has sold for 851 times its face value as it was printed in the wrong colour.
The "highly unusual" 1983 coin sold for £170.20 on eBay because it was minted with a rare error.
The coin has been struck on a bronze blank rather than the standard 20p blank.
As a result of the striking error, the coin appears bronze in colour, rather than silver.
The coin is accompanied by a letter from The Royal Mint Museum, who authenticated the coin following a 'thorough examination' using 'spectographic analysis'.
They found the error is likely to have happened as a result of a bronze blank coin being struck between two 20p dies.
It's thought to be one of two known 20p coins to have been struck on a bronze blank.
In the listing, the coin is described as "highly unusual" with the error making its value skyrocket.
The listing reads: "Rare 1983 20p Royal Mint striking error, struck on a bronze blank rather than the standard 20p blank.
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"This coin is described as one of two known 20p coins struck on bronze blanks, with the other coin referenced in a previous lot.
"It's been tested and verified as 97.10% copper, weighing 3.62g.
"The coin was sent to the Royal Mint Museum for examination, and a copy of their official letter of authentication is included with the sale.
"A highly unusual and collectable Royal Mint error coin, ideal for serious collectors of British decimal coinage, minting errors, and rare 20p varieties."
The Royal Mint's letter states that it appears a bronze blank, most likely intended for 'one of the many overseas countries they produce coins for', was struck between 20p dies.
One keen collector snapped up the coin for £170.20 plus £3.42 postage on Sunday, May 31.
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That means the coin was sold for 851 times its shop value and will be sure to have Brits checking their change for any similar errors.
First issued in 1982, the 20p is one of the UK's newest circulating denominations.
Since then, there have been several different variations of the coin.
In 1998, the coin was updated to feature Maklouf's portrait of Queen Elizabeth II, while the reverse of the coin depicts a crowned Tudor double rose in a design by William Gardner.
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In 2022, Ian Rank-Broadley's portrait of the Queen was replaced by Jody Clark's design.
Gardner's reverse design featured on the 20p until 2008, when it was replaced by the definitive 'shield' design that currently appears on UK coins up to the value of 50p.
When united, and carefully arranged in the correct order, the 50p, 20p, 10p, 5p, 2p, 1p, make up the Royal Arms in its entirety.
Have you ever found a rare coin? Tell us in the comments below.
