A rare 50p with an unusual 'double stuck error' has sold for more than £500 on eBay.
The design on the coin at been pressed on twice - and there may be thousands more in circulation.
The seller says the error occurred when the coin was being manufactured.
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Photos show the standard image of Britannia, seated beside a lion, in the centre of the coin as it should be.
But in the bottom left corner, you can see the top of the design has been pressed again - you can just about see the head of Britannia and the fork being held, reports the Mirror.
You can also make out the “E” and “W” from the word “NEW” and the letter “P” from the word “PENCE” in the second strike.
Striking a coin is the process where an image is pressed onto a blank metal disc.
In the item description on eBay, the seller said: “Double struck coins can be either on-centre or off-centre.
“The reasons for multiple strikes are as varied as the number of strikes that can occur.
“Ejection failures which prevent a planchet to correctly discharge from the striking chamber are numerous.”
The coin sold for £510 exactly, plus £10 for delivery, after attracting 19 bids following a seven-day auction.
You can see the eBay listing here.
Error coins are particularly valuable to collectors as they could be one of a kind, or one of only a handful.
Sometimes it isn’t clear how many times an error has occurred.
But we’ve reported on several “double struck” error coins recently - reminding Brits to keep an eye on their spare change for anything unusual.
Last week, we saw how a rare £1 “double struck” coin sold for £366 on eBay.
You should also watch out for misalignment errors, as these could be valuable too.
You should always be wary and do your research first before buying any coin, as there are fakes floating around online.
Websites and Facebook groups from change experts like Coin Hunter can help you work out if a coin is the real deal or not.
You can also ask the Royal Mint to verify coins.
If you're selling a coin, be aware that there isn't a guarantee for how much you could get on eBay unless you set a reserve price.
Coins are really only worth what someone is willing to pay for them.
