1. A rare Irish 20p coin could fetch up to $6,800 (€6,000) at an upcoming auction in the Dublin. Read More: A guide to valuing all your old Irish coins.
2. These Rare 20p Coins Are Worth Up To £100 EACH! In 2009, the Royal Mint made a BIG mistake on some 20 pence coins making them worth at least £50 each! If your purse is bulging with all of that.

Rare 20p Coins 2005

One of the rarest coins ever, the bronze 20p coin is dated 1987. The Royal Mint said it was the result of an extremely rare minting error, with a blank 1p somehow finding its way into the presses and ending up with a 20p struck onto it.

The error coin could be worth up to £750 – but it’s not just that 20p coin that could be worth a small fortune.

Unlike 50p and 10p coins, the 20p design has remained almost the same since it was first minted back in 1982, making only a handful of them actually valuable to a collector.

The coins that are worth the most are “mule” ones which have been minted with inaccuracies on them by mistake.

It’s not just 20p coins issued by the Royal Mint that are popular either, with ones made in the Channel Islands and Gibraltar also turning a profit online.

We’ve put together a round-up of the most valuable 20p coins – so keep your eyes peeled. Here’s what to look out for:

Bronze 20p coin – £750

One mistake turned the normally silver 20p bronze, after being struck onto a 1p blank that had slipped into the wrong batch.

These are super rare and aren’t specific to any year, although one from 1987 did crop up which coin site ChangeChecker ended up giving away as a prize.

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Coin enthusiast Colin Bellamy, who runs Coin Hunter, has valued these coins at £750 each.

We’ve had a look online to see how much these error – or “mule” – coins sell for but it doesn’t look like there are any currently available on sale.

They truly are a rare find which could make them worth even more.

2008 20p coin without a date – £225

Back in 2009, the Royal Mint accidentally issued up to 200,000 20p coins without a year stamp, making it the first coin in 300 years to be released in circulation without a date.

The coin was circulated after the reverse of each denomination from 1p to £1 was redesigned back in 2008, bringing the date to the “heads” side.

One of these coins sold in November last year for a whopping £224.81, although most of them sell online for around £70.

Look out for the missing date on the side with the Queen’s head.

What are the most valuable error coins?

1983 New Pence 2p coin worth up to £1,250

All 2p coins minted between February 1971 and 1982 should say “new pence” on the front, while those released after this date say “two pence”. But in 1983, a glitch meant a batch of 2p coins were printed with the old wording on them making them valuable to collectors.

Silver 2p (1971 to 1992) worth up to £1,000

These coins were accidentally struck on silver and can be easily mistaken for a 10p. James Weller from Kent found one in his change at home. He hasn’t sold it yet, but if it sells for anything like other silver 2p coins, then it could be worth more than £1,000.

All zinc £2 coin worth up to £800

Rare 20p Coins

The rare Standing on the Shoulders of Giants £2 coin has only been stamped on nickel brass, rather than on two types of metal – nickel brass and copper zinc. Approximately 10,270,000 of these types of coins were issued for circulation in 2007.

Bronze 20p worth up to £750

One of the rarest coins ever, the bronze 20p coin is dated 1987. The Royal Mint said it was the result of an extremely rare minting error, with a blank 1p somehow finding its way into the presses and ending up with a 20p struck onto it.

Rare 20p Coins 1983

London 2012 Olympics Aquatics 50p first design worth up to £1,500

Not technically a printing error, this coin was originally minted with water passing directly over the swimmer’s face, but it was later modified to include less water so you can see the swimmer more clearly. Experts have valued this one to be worth between £1,000 and £1,500.

Gibraltar and the Channel Isles

It’s not just sterling issued in the UK that is worth more than face value – special edition 20p coins from Gibraltar and the Channel Isles can also be valuable to collectors.

While they’re not worth quite as much, you can still make a profit if you’re willing to part with one.

It’s worth pointing out that these coins aren’t likely to turn up in your change as UK businesses don’t tend to accept sterling issued by any provider other than the Royal Mint.

But if you’ve visited one of the islands and still have change in your pocket then it’s worth checking for valuable coins.

Isle of Man 20p – £13.50

The Rally Isle of Man – or Manx International Rally as it used to be known – is an annual racing competition that’s been running since 1979.

It’s celebrated on a number of coins, including the Suburu and Ford 20p piece.

One of these sold on eBay early this year for £13.50 after attracting nine bidders – that’s 67 and a half times its original value.

Guernsey 20p – £5

The State of Guernsey began issuing its own designs on coins in 1982 and they are still issued today.

While they’re not rare, you can make a small profit by selling the coin online where they sell for around a fiver.

Gibraltar 20p – £2.50

The most valuable 20p coin from “the rock” is the Keys of Gibraltar design worth around £2.50 on eBay, which is 12 and a half times it’s original value.

They’re not rare – they were first minted in 2005 and are still available today.

The design celebrates the ancient tradition of when the city would lock its four gates during a storm to protect it from the raging sea.

Earlier this week, the Royal Mint reissued a special edition set of 50p coins – including the rare Kew Gardens design – that sold out within hours.

We reveal the rarest 2p coins that are in circulation – and some could be sold on for hundreds.

There are 37 different £2 coin designs currently in circulation, and some of the rarest are worth up to 20 times face value – £40.

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Ten years ago, in November 2008, the Royal Mint issued an undated 20p coin. Instead of featuring the date that they were minted, as all coins are meant to, a mix up meant that the year of issue did not feature. This was the first time an undated coin entered circulation in more than 300 years; the last occasion being in 1672 during the reign of Charles II.

The problem arose when an old heads design was used with a new tails design. The date was not present on either side of these designs. The date was meant to move from the reverse (tails) side to the obverse (heads) side, but some coins were produced using the tooling for the obverse of an old design and the reverse of the new design. The date was missing from as many as 200,000 coins before the problem was noticed.

Here are ten things you may not know about the 20p coin, in commemoration of the ten-year anniversary.

Little coin, big history

1) The 20p coin was introduced on June 9, 1982. At the end of the 1970s, there was a view that the decimal currency was too heavy. The introduction of a 20p coin substantially reduced the weight of coins in circulation by decreasing the number of 10p coins in use.

2) The coin was introduced more than ten years after the UK and Ireland changed to a decimal system of currency, which was on February 15, 1971. Before decimalisation, the currency was based on pounds (240 pence), shillings (12 pence) and pence, so 20 shillings made up a pound. The move to decimal currency ensured that all the currency used base 10, rather than the previous system, which used both base 12 and base 20.

3) In 1982, at the same time the 20p was introduced, the word “new” in “new penny” or “new pence” was removed from coins and replaced by the number of pence. From its introduction, the 20p coin only ever said “twenty pence”.

4) In 2008-09, 136m 20p coins were minted, worth £27.2m pounds. In March 2016, the Royal Mint reported that there were more than three billion 20p coins in circulation, which are are worth more than £600m.

5) The undated 20p is legal tender and should you find one it has a face value of 20p. Of course, they are sought by collectors and some stories have said they were worth thousands of pounds, although a cursory search on eBay suggests you’re more likely to get around £50 for one.

Rare 20p Coins Value

6) A coin which has the incorrect combination of obverse (heads) and reverse (tails) is called a “mule”. A mule could be made up of two obverse sides, or an incorrect combination of obverse and reverse, which is the case with the 2008 undated 20p coin.

7) The shape of a 20p coin is an equilateral curve heptagon. This means it has seven edges, which are all the same length. However, the edges are not straight. As the name of the shape suggests, the edges are curved. The 50p is also an equilateral curve heptagon.

8) All circular coins have the same width (diameter) no matter how you measure it. It might seem strange, but an equilateral curve heptagon also shares this property. No matter how you try and measure across its surface, you will find that the measurement is the same. This is important for coins as it makes life a lot easier for vending machine manufacturers as you know what the width of the coin should be, no matter its orientation. But from a user’s point of view, a 20p will feel different to other coins so is easy to differentiate, especially for those with visual impairments.

9) The 20p coin is legal tender up to £10 (which is 50 20p coins). You cannot legally pay for anything with more than this many 20p coins.

10) Since its introduction in 1982, the 20p coin has featured four different portraits of the Queen. They were designed by Arnold Machin (1982-1984), Raphael Maklouf (1985-1997), Ian Rank-Broadley FRBS (1998-2015) and Jody Clark (2015 to date).