The rare marking on error 50p that makes it worth 100 times its face value – is one in your change?
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A SMALL error on a particular 50p coin has seen its value sky-rocket - and you could have one in your change.
This coin is selling for more than 100 times its face value because of printing mistake that left it with unique markings.
The Isaac Newton 50p is a rare coin that has got collectors outbidding each other on eBay.
A rare coin guru, who goes by the name coincollectingwizard on TikTok, said: "The Isaac Newton coin is one of the most popular 50ps in circulation."
This coin appears to have several extra lines across the portrait of Queen Elizabeth.
The collector added: "If your coin has these lines then congratulations, you have found it.
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"Although we don't know for sure how many of these error coins are in circulation, they are thought to be extremely rare."
The elusive item has been listed on the secondary market for many times more than the face value.
It is thought that the markings on the coins were caused by an error during the striking process.
This is the step where blank coins are engraved with the designed images.
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In a manufacturing problem known as "die clash" the front and back dies of a coin press together without a blank coin in between.
This leads to printing errors on the coin.
The extra grooves on this rare 50p are not grooves that have scratched into the coin but are lines that stand proud of the coin face.
Hopefully this means the unique pocket change will be easier to spot.
Other rare coins include the Olympics 2011 Aquatic 50p which can sell for thousands of pounds.
With only around 600 in circulation if you spot one with lines covering the swimmers face you could be in for some extra cash.
If you manage to get hold of the Gruffalo's Child 50p, keep an eye on the creatures pawprint.
The coin with a misprint on the paws can sell for up to £42.99 on eBay despite being first available for £12.99
Make sure to check the back of the sofa for the famed 2009 Kew Gardens 50p.
This one has been a collectors dream for years and sells for up to £142 a pop.
CHECK IF YOU HAVE A RARE COIN
Rare coins and valuable notes can be worth far more than their face value - sometimes thousands of pounds.
But sometimes it's just small differences that make them so lucrative.
The most valuable coins are often ones with low mintage numbers or an error.
These qualities typically make them valuable to collectors.
It's always good to remember a rare coin is only worth as much as someone is willing to pay for it.
It might be that someone needs your coin to complete their collection, in which they may be willing to pay more.
SELLING YOUR RARE COINS
There are lots of different factors to consider when trying to value a coin, including its condition and mintage, so it's important to do your homework first.
If you've got a potentially rare coin that you would like to sell at auction, you can contact .
This organisation has a team of experts who can help you to authenticate and value your coin.
You will need to enquire via email, and a member of the valuation team will contact get back to you.
Take a picture of your coin and attach it to the email - you can find all the details on The Royal Mint's website.
Be wary that you will be charged for this service though - the cost will vary depending on the size of your collection.
If you are looking to buy or sell a coin online through a marketplace such as eBay, it's crucial to know exactly what you are purchasing.
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This is because anybody can list a coin on eBay and charge whatever amount they wish.
You should also be conscious of fakes online - and keep in mind that on eBay a buyer could pull out, which means the coin won't have sold for the price it says it has.
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