NEED a little extra cash? You could be sitting on a fortune if you’ve got a rare £1 coin hiding in your wallet.

With some of the most unusual coins fetching more than 10 times their face value on eBay, you could earn yourself a pretty penny.

 The new 12-sided design for the £1 coin - but it's the old style round coins that could be worth more than a quid

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The new 12-sided design for the £1 coin – but it’s the old style round coins that could be worth more than a quidCredit: EPA

Here are the coins you need to keep an eye out for if you want to be quids in…

What are the rarest £1 coins?

Here are the ten rarest £1 coins still in circulation as well as what they are currently selling for on eBay.

2011 Edinburgh £1

 On eBay, Edinburgh £1 coins can sell for more than a tenner
On eBay, Edinburgh £1 coins can sell for more than a tenner

According to the blog ChangeChecker, the rarest one pound coin currently in circulation is the Edinburgh £1.

The coin was part of a series depicting the four capital cities of the UK and is the only £1 coin with a mintage below one million.

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ChangeChecker’s calculations suggest there are probably 935,000 Edinburgh City coins still in circulation.

On eBay, the highest price we saw one of these coins go for was £10.50.

That means you could sell it for more than 10 times its face value.

2011 Wales Cardiff City £1

This coin was also part of the capital cities series, but it is slightly less rare, with an estimated circulation of 1,615,000.

Designed by Stuart Devlin, goldsmith and jeweller to the Queen, this coin depicts the circular Coat of Arms of Cardiff as the principal focus to represent Wales.

The highest price we could find on eBay recently for the coin was £11.01.

2010 London City £1

 The coin features a magnified image of the badge of London
The coin features a magnified image of the badge of London

A third coin released as part of the capital cities of the UK series was the London £1.

The coin shows the portrait of the Queen and on the reverse side shows the four official badges of the capital cities of the UK, with a magnified image of the badge of London.

ChangeChecker estimates there are 2,635,000 coins left in circulation.

But you’re unlikely to make a mint out of yours if you find one.

The highest amount we saw this £1 sell for was £2.99 on eBay.

2008 Royal Arms £1

 There are 3.9million of these in circulation

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There are 3.9million of these in circulation

There were 3,910,000 million of these £1 coins minted in 2008.

It features the Royal Shield of Arms coin, and shows various designs including lions and a heart on the shield.

It won’t go for that much if you find one though.

We found one being flogged on eBay for £2.20.

2014 Thistle and Bluebell £1

 This coin design features the thistle and bluebell for Scotland
This coin design features the thistle and bluebell for Scotland

In 2014, the Royal Mint launched two new £1 coins – one for Northern Ireland and one for Scotland.

This Scottish coin design features the thistle and bluebell, and is the fourth rarest coin in the UK.

There are an estimated 5,185,000 still in circulation.

You won’t get too much for them though – we saw one recently being sold for £1.95 on eBay.

2013 Daffodil and Leek £1

 The coin features a daffodil - the national flower of Wales
The coin features a daffodil – the national flower of Wales

This daffodil pound coin was released in 2013 as a floral set alongside a rose pound coin.

The daffodil is the national flower of Wales, while the leek is also a national emblem of Wales.

The pair of coins marked the first release of a commemorative £1 since 2011.

On eBay, these coins are going for around £2.50.

2013 Rose and Oak £1

 The coin shows the rose and the oak to represent England
The coin shows the rose and the oak to represent England

The rose and oak coin was part of a floral set along that launched in 2013.

It’s still fairly unusual with around 5,270,000 still in circulation.

Unfortunately, they’re not selling for much at the moment, the highest recent price we could see was £3.20 on eBay.

2014 Flax and Shamrock £1

 This design features the shamrock and flax for Northern Ireland
This design features the shamrock and flax for Northern Ireland

The 2014 flax coin was released alongside the thistle coin, to complete the series of four coins that began in 2013.

It continues the tradition of honouring the home nations of Britain by featuring familiar floral emblems.

However in this series, the emblems are paired together with other less well-known floral symbols.

This design features the shamrock and flax for Northern Ireland.

It will fetch up to £2.25 on eBay.

2010 Belfast £1

 The Belfast coin is the eighth rarest £1 coin in the UK
The Belfast coin is the eighth rarest £1 coin in the UK

There are more than 6.2 million 2010 Belfast coins in circulation, meaning it is the ninth rarest £1 coin in the UK.

The design is part of the ‘City Series’ collection, and you can get up to £2.20 for circulated coins on eBay.

1988 Crowned Shield £1

 The 1988 Crowned Shield coins sell for around £3 on ebay
The 1988 Crowned Shield coins sell for around £3 on ebay

This coin depicts one of the UK’s heraldic emblems – the royal arms of the queen, topped by the crown of St Edward.

There are 7.11 million in circulation making it the fifth rarest pound coin there is.

We saw one being sold for £3.20 on eBay last month.

How can you check the value of a coin?

If you think you’ve got a coin that could fetch a few bob then it’s worth getting it verified.

The Royal Mint can tell if your coin is legit and not counterfeit, but doesn’t do valuations.

In the meantime, if you want a coin valued you could contact Sovereign rarities –  a team of coin specialists, collectively with over one hundred years of experience.

Stanley Gibbons, which specialises in stamp collections, also offers a free valuation service through its rare coin division, called Baldwin’s.

For more common coins you could try selling them online, via a website like eBay.

This post first appeared on thesun.co.uk

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