People have been urged to check their change after a "botched" £1 coin turned out to be worth 600 times its face value. 62-year-old Diane Bath, who runs a Post Office in Cumbria, took delivery of coins stamped with King Charles’ face which turned out to be a goldmine. The first coins featuring the new monarch were released back in 2022, following Queen Elizabeth II's death.

All UK coins bearing the effigy of Elizabeth II will remain legal tender and in active circulation. Beautifully reimagined by collection designer David Lawrence. The Queen’s Panther is the latest beast to join The Royal Tudor Beasts Collection.

Head this way - https://t.co/XMJyECrvRn pic.twitter.

com/9POhWX7Us8 — The Royal Mint (@RoyalMintUK) September 17, 2024 Diane, from the North East, spoke to the Sun after staff spotted that a £1 coin in the delivery appeared to be entirely gold. The error by The Royal Mint meant that it was all brass, rather than the two-tone nickel. It is believed to be an "incredibly rare" mistake and a one-of-a-kind error.

“I am absolutely over the moon," Diane told the tabloid, adding: "Obviously we handle cash all of the time and it’s the most exciting find I’ve ever had in over two decades. "I had a look online and couldn’t see one like it, so I knew it must be worth a decent amount.” Recommended reading: Royal Mint rarest coins as 20p coin sells for £61 on eBay Royal Mint rarest coins as 50p sells for £150 on eBay NS&I issues urgent warning to anyone with Pr.