With the old round pound coin coming out of circulation by autumn, you should already by checking your piggy banks, pockets and down the back of your sofa before it is too late and they cease to be legal tender.
Whilst you are looking however, you may want to keep your eye out for a few other coins which could be worth a lot more than their face value suggests.
Here are the coins you should be looking out for .
London Olympic 50p coin, worth £3,000
Currently listed for £3,000 on eBay, you won't want to let this one slip through your fingers.
29 different Olympic Games designs were released in 2012, with a full set usually worth around £35.
There is, however one coin which is worth a lot more.
The original aquatic coin shows water passing directly over the swimmer's face, of which just 600 were released before the design was altered, showing the swimmers face without water covering it.
Those original designs could get you a small fortune on eBay.
'New Pence' 2p coin, worth £650
After Britain converted to decimal currency in 1971, all 2p coins said "New Pence" on the reverse until 1981, when the Royal Mint decided to change it to "Two Pence" in 1982.
However, in 1983, a small number reading "New Pence" were accidentally produced and then found themselves in collectors sets.
Check your 2p to see if any slipped into circulation, as it could make you up to £650.
Dateless 20p piece, worth £100
When redesigning the 20p coin nine years ago, the Royal Mint switched the date from the back to the front of the coin.
Between 50,000 and 200,000 were, however, produced with no date during this time due to an error mismatching the old and new designs.
The coins can now fetch up to around £100.
Kew Gardens 50p, worth £50
According to Chronicle Live , the Royal Mint says this is the most rare coin in circulation.
It is believed that only one in 300 people have a Kew Gardens 50p, and it is currently worth around £50.
The EC commemorative 50p coin, worth £20
There are only 109,000 of these coins in existence and if you have one hidden at the bottom of your purse, it could be worth up to £20.
The Royal Mint issued the coin in 1992 and 1993 to celebrate the British presidency of the council of Europe.
The 50p coin was reduced in size in 1997 and are therefore no longer in circulation.
Guy Fawkes £2 coin, worth up to £100
"Pemember, Pemember the Fifth of November".
Yes, we know that is not correct, but it could be the quote on a Guy Fawkes £2 coin in your pocket.
To commemorate the 400th anniversary of the gun powder plot on the Houses of Parliament, the Guy Fawkes coin was released in 2005.
However, instead of reading "Remember, Remember the Fifth of November", some of the coins say "Pemember, Pemember."
The coin is currently listed on eBay for £100.
Mary Rose and King James Bible £2 coins, worth £6.58
These coins are selling for £6.58 on eBay.
A total of 20,000 of each of these designs were released by the Royal Mint in 2011 as limited edition coins to mark the 500th anniversary of the Mary Rose and the 400th anniversary of the King James Bible.
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