Finding a rare coin in your collection is great news.
Some coins could be worth a lot of money, while others are considered valuable for many reasons.
If a coin has low mintage, meaning there aren't many of them made, it's usually considered valuable.
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But if it's manufactured with a mistake or a note has a unique serial number, it can be worth more than its face value.
It's always worth checking your own change to see if there's any odd coins or notes in there.
Here are what to look out for which could be worth a lot of money…
£10 with AH17 75 serial number – up to £3,600
The plastic £10 note which launched just a few years ago could be worth thousands of pounds.
One of the 10 notes bought for £3,600 a few years ago had the serial number AH17 75 – the year of Jane Austen's birth.
ChangerChecker.com said the serial numbers you need to look out for are:
- The serial numbers 16 121775 and 18 071817 as they represent the author's date of birth and death
- The serial number 17 751817 as it’s her birth and death combined
- The 28 011813 as it's the date when her most celebrated novel, Pride and Prejudice, was first published
Other serial numbers might be popular with collectors.
Bronze 20p coin – £750
These are incredibly rare and aren't specific to any year.
But one from 1987 did crop up which coin site ChangeChecker ended up giving away as a prize.
Colin Bellamy, who runs Coin Hunter, valued these coins at £750 each.
Previously, a bronze 20p from 2011 sold for £150 on eBay.
Double Queen head error coin – worth £550
One copy of a 50p coin minted with an error includes the Double Queen head.
It was struck three times and in a way that looks a bit like two coins are overlapping.
The error means you can hardly make out the design on either the reverse or obverse.
Last year, a coin with this error sold for £550 as a bidder thought it was over 1,000 times its face value.
Kew Gardens 50p – £175
The 50p Kew Gardens coin features the Chinese Pagoda at the famous London landmark of the same name.
Just 210,000 were released into circulation in 2009.
Last month, a circulated Kew Gardens 50p sold for £175.
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Olympic Wrestling 50p – £11
Commemorative 50p coins were made to mark the London 2012 Olympic games and some are still popular online.
The Wrestling 50p was minted in 2011 and features two athletes competing in a stadium full of lights and fans.
There are more than 1.1million of these special coins in circulation, according to the Royal Mint.
Often it sells for around £11 on eBay.
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