Rare coin collectors will have an idea of what to look in a bit of change.
It could be that there's an error on the money, or there's a limited amount of them around.
Now when it comes to a 50p coin, there's a lot of different designs out there worth serious money.
Change Checker updates its scarcity index which looks at these figures and ranks coins every three months.
But for now some of these could still sell for an absolute fortune on eBay.
And if you're worried you'd be sold a fake, experts at Coin Hunter or Royal Mint could help you see the difference.
Here are five rare coins which can sell for more than their face value.
1. Kew Gardens 50p – £721
One of the rarest 50ps out there is the Kew Gardens coin.
Often bidders will try their absolute hardest to get their claws on one as they're popular among collectors.
Also it's because only 210,000 of them were released into circulation which makes them one of the most sought after coins.
We've seen a rare Kew Gardens coin sell for around £200-£300, but some could reach even more.
Recently, a rare coin with a minting error flogged for as much as £721 on eBay.
Rare Kew Gardens 50p sells for fortune on eBay – and you could have one too
2. Football 50p – £31
This coin was created to commemorate the 2012 Olympics and it's among the rarest as it features an explanation of the offside rule.
There were just over one million put into circulation and recently one sold for £31 on eBay.
3. Judo 50p – £27
Over 1.16 million of these Judo coins were put into circulation in 2011 to celebrate the London 2012 Olympic Games.
It shows two athletes locked in a judo fight, with one throwing their opponent to the floor.
Previously, a seller managed to scoop £27 on eBay for a copy they had of the coin.
4. Triathlon 50p – £16
The Triathlon 50p coin was also from the 2012 Olympic Games in London.
It shows athletes doing the three sports – swimming, cycling and running.
Only 1,163,500 were put into circulation in 2011.
5. Wrestling 50p – £16
Around 1.13 million of these coins entered circulation in 2011.
The 50p coin shows two athletes wrestling in front of a crowd, with one being thrown to the ground.
Complete with its Olympic card, this 50p can sell for around 30 times its face value, if not more.
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