A rare 20p coin has sold for £57 on eBay because it has a huge error in its design.
The seller claims it is a “mule” coin - or “undated 20p” - because it has no date minted on it.
Thousands of 20ps are thought to have been released into circulation with this error after the Royal Mint altered its design back in 2008.
The change saw the date moved from the back of the coin to the front, next to the Queen's head.
But in some cases, the old die was accidentally used - meaning a batch was issued with no date on either side of the coin.
It’s estimated by The Royal Mint that no more than 250,000 coins made it into circulation, according to experts at Change Checker.
These coins are particularly valuable to collectors as they are the first batch to have made it into circulation without a date for more than 300 years.
Bidding for the 20p started at £30 but it ended up selling for £57 following a three-day auction, which attracted 13 bids from seven people.
Error coins can be particularly valuable to collectors as they could be a one-off - but a coin is only ever worth what someone is willing to pay for it.
If you're planning on buying a coin, be aware of fakes being sold on eBay so you don’t get scammed out of money.
You can get coins verified by the Royal Mint to check they're the real deal.
It is hard for the Royal Mint to say exactly how many error coins could be in circulation, as it manufactures between three million and four million coins a day.
But mistakes do happen - so it's worth keeping an eye out in your spare change for anything unusual.
This isn’t the only error coin that has sold for a mint on eBay in recent weeks.
A rare £1 coin that had also been “double minted” fetched £253 on the auction site.
Meanwhile, a coin expert said how this HG Wells £2 coin could be worth up to £1,000 due to a minting error.
