In the video, they held up the coin to the camera and urged viewers to check the bottom right corner. They said it is worth checking for an "undated" 20p in your purse, just in case. The expert ...

A rare 20p coin which is missing the date has sold for almost £60 on eBay. This rare coin is called an "undated" or "mule" 20p and there might be thousands like it ...

The mistake means the coin is considered a collector’s item. An example of a rare undated 20p mule coin (Image: eBay/Getty/Vandervelden) Prior to November of that year, the date on 20p coins ...

One lucky seller in County Durham recently sold their undated 20p for £69.99 – nearly 350 times its face value. Meanwhile, The Britannia Coin Company lists similar coins on their website for as ...

And taking the top spot is an undated 20p coin, which sold for an average of £64 last month - making it worth more than 300 times its face value. Experts at Change Checker have dubbed this 20p ...

From checking the back of the sofa to asking for extra change at the till, you could make a profit if you have this 20p coin which features an error. The rare undated ...

Change Checker released its latest eBay Tracker update just before Christmas, revealing which coins saw their value increase the most on the resale and auction website in December. And taking the top ...