Empty your pockets and check your change right now as Brexit 50p coins are selling for up to £15,000 online due to their rarity.
The Royal Mint released the 50p pieces to mark the official Brexit date of January 31, last year, on one side they have the Queen's head, and on the other an engraving saying 'Peace, prosperity and friendship with all nations'.
Around 10million of the coins were released, but most ended up in the hands of collectors.
Two of these 50ps recently sold on eBay for £15,000 each, 30,000 times more than their face value.
Some are even on sale for up to £50,000 on the auction website, reports the Mirror.
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Other examples of the coins have sold this year for between £3,500 and £10,000. If you do find you own one of the special 50ps, be aware that you may be undercut when you try to sell it.
Some eBay sellers are listing the Brexit 50ps for a more wallet-friendly price of £1.35 - perhaps not realising the value of what they have.
ChangeChecker expert Alexandra Fiddons previously said: "The 50p was teased for a long while before the UK's official exit from the European Union and when it was officially released into circulation, people were eager to snap them up for their own collections.
"This coin marks an incredibly significant moment in British history and it's possible that people who aren't usually interested in the hobby, may have been tempted to secure this 50p to commemorate the event forever."
There is one other version of the Brexit 50p that is even rarer - and is worth much more than the 10 million in circulation.
Some of the Brexit 50p were minted two years ago with the date of October 31, 2019 - the original Brexit date, which ended up being missed.
Then-chancellor Sajid Javid had asked for three million of the coins to be made ready for this date, with another seven million to follow later in the year.
Around one million of the coins were made before the government realised it would miss the October 2019 Brexit date.
While most of the coins were melted down by the Royal Mint, some made it into the wider world. If you are tempted to buy any second-hand coins from eBay, beware of fakes circulating.
If you're bidding online, the Royal Mint encourages you to do your research first.
"If you are buying a coin on the secondary market we would recommend doing some research first, and there are a lot of useful resources on The Royal Mint’s website to help ensure collectors pay a fair price," a statement said.
