A rare 50p coin can make a coin collector a decent sum of money, if they manage to spot one.
Sometimes they pop up in your change, other times they are sold in special collectors edition.
Either way, they can make an great edition to a collection or a bit of pocket money for a savvy seller.
This coin has sold on eBay for £150 in recent days, but this is far less than it has sold for in previous times.
The 50p coin was created for the 2012 London Olympics, and is rare for a very special reason.
There are, in fact, two different versions of the coin and only one of them is worth hundreds of pounds.
Seller “oskarbalt-0” advertised the coin as: “Olympic Swimmer Aquatic 50p 2011 RARE with lines across face.”
And they were right to point out the lines over the face as this is exactly what make the coin so rare.
The coin was sold on 22 March for £150 after two bidders battled it out of the rare piece.
Oskarbalt-0 wrote of the coin: “You know what it is!
For those, who don’t know: The Aquatics coin, by Jonathan Olliffe shows a female swimmer in water.
“The Royal Mint sold all of the Olympic coins separately in sealed packs (they were also circulated normally).
“Some of the sealed individual packs contained a coin that was clearly not meant to have been sold and is now referred to as the ‘withdrawn’ or error Aquatics 50p with lines on the face of the swimmer. Free express postage.”
The coin was not created in error, but Royal Mint decided after initially releasing the coin that the original design was too confusing.
So they removed the lines from the face on further coins produced.
This coin is a true collectible, according to experts, and it worth in the region of £750.
What are the other rare 50p coins that can make you cash?
The Blue Peter edition of the Athletics 50p coin is also worth a good amount of money.
Only 19,751 of these coins exist and they can net you £100.
Which are the rarest £1, £2, 50p, 20p, 10p and 2p coins?
Rarest £2 coins
The rarest £2 coin is the 2002 Commonwealth Games NI coin with 485,500 in circulation. This is followed by the 2002 Commonwealth Games Wales which has 588,500 in circulation.
Next up is the 2015 Navy, and there are 650,000 in circulation.
Rarest £1 coins
The most rare £1 coins are all part of a series celebrating the British capitals.
The rarest of these is the 2011 Edinburgh coin, with 935,000 in circulation. Of the 2011 Cardiff coins there are 1,615,000 in circulation, while the 2010 London coin has 2,635,000 in circulation.
Rarest 50p coin
The rarest 50p coin is the Kew Gardens coin, which is also the rarest coin in circulation. It there were only 210,000 minted.
The football Olympic 50p coin has 1,125,500 in circulation, and the wrestling coin has 1,129,500 in circulation.
It is not so easy to evaluate the rarest 20p coins, 10p coins and even 2p coins as exact circulation figures are not known.
However, various versions of the coins are known to sell for large sums.
These include the dateless 20ps, which are actually part of a run from 2008. There may be between 50,000 and 200,000 of these coins in circulation.
The 1983 ‘New Pence’ 2p coin can also sell for a huge sum, up to £650.