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Rare 20p that's the 'wrong colour' sells for more than 800 times its face value
The coin was authenticated by the Royal Mint Museum and tested at 97.10% copper, making it one of two known bronze-blank 20p errors.
- A rare 1983 20p coin sold for £170.20 on Sunday, May 31, achieving 851 times its face value after being struck on a bronze blank rather than standard metal.
- The Royal Mint Museum authenticated the coin following 'thorough examination' using 'spectographic analysis', determining a bronze blank intended for 'one of the many overseas countries they produce coins for' was struck between 20p dies.
- Testing verified the coin as 97.10% copper weighing 3.62g, with The Royal Mint Museum's official authentication letter included in the sale, establishing it as 'a highly unusual and collectable Royal Mint error coin' for serious collectors.
- The exceptional 851-times valuation is expected to prompt Brits to examine their change for similar minting errors, while the listing emphasized the coin as one of two known 20p coins struck on bronze blanks.
- Since its 1982 introduction, the 20p has undergone multiple design changes, with portraits by Maklouf, Ian Rank-Broadley, and Jody Clark replacing earlier versions, while its reverse evolved from William Gardner's Tudor double rose to the current 'shield' design forming part of the Royal Arms.
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