The importance of security features on UK coins

When it comes to the coins jingling in your pocket, the Royal Mint employs a number of sophisticated techniques to ensure each coin is secure and genuine.

But how much do you actually know about the security features that keep your coins safe?

Visible security features

Bi-metallic design

The distinctive bi-metallic design seen in coins like the twelve sided £1 coin and post 1997 £2 coins is not just an aesthetic choice, but an advanced security feature. The combination of two different metals – a nickel-brass outer ring and a cupronickel inner core – increases the complexity of the minting process, making fraud significantly more challenging.

Bi-metallic £2 and £1 coins
Bi-metallic £2 and £1 coins

Milled edges and edge lettering

First introduced by the Royal Mint in the 1660s, the complex process of adding milled (grooved) edges or edge lettering to UK coinage not only provides a high degree of visual security, but also makes the coins difficult to counterfeit accurately.

The UK £2 coin has a milled edge
The UK £2 coin has a milled edge

Lenticular features

Special lenticular imaging is another ingenious feature incorporated into some UK coinage. This involves an image that changes appearance when the coin is titled at different angles. The bi-metallic £1 coin, first issued in 2017, showcases this feature beautifully. When tilted, the pound sign (£) changes to the number one (1), creating a dynamic visual effect that is not only mesmerising but also serves as a powerful deterrent against counterfeiters.

Lenticular feature on the 12-sided £1 coin shows the ‘£’ symbol and the number ‘1’ when tilted

Fine engraving, design decisions and micro-lettering

The introduction of new cutting techniques for steel tooling, combined with advancements in computer-aided modelling, has enabled coin designers to incorporate previously unattainable details. These details are as complex as those on a banknote but benefit from being three-dimensional.

Some bi-metallic coin designs extend across both the inner and outer sections of the coin, adding a layer of complexity that helps deter forgery.

The reverse design on the 12-sided £1 coin is struck across both the inner and outer section of the coin

Certain coins even include micro-lettering, an advanced design feature that’s hard to produce with consistent quality. For example, the lower inside rims of both the obverse and the reverse of the twelve sided £1 coin feature micro-lettering.

The £1 coin features micro engraving on the lower inside rims.

Shape

The introduction of the dodecagonal (twelve sided) £1, first issued in 2017, serves as another security feature. The distinctive shape of the coin makes it much more difficult to counterfeit compared to the previous round pound design.  

Hidden Security Features

Secret messages (Electromagnetic signature)

Some new coins are fitted with a special plating that contains an electromagnetic signature (EMS). When passed through a small electromagnetic field, each coin creates ripples or other disturbances that can be detected and analysed. Different combinations of size and metal cause distinct patterns when the coins are passed through such a field. The distinct pattern of a particular coin is called its ‘electronic signature’.

Details of the security features on the 12-sided £1 coin

‘Hidden’ unknown security feature

The Royal Mint announced that the twelve sided £1 coin includes a secret ‘High Security Feature’ which is even more advanced than an Electromagnetic Signature. Details of this feature are top secret, but it’s thought to involve material within the plating layer of the coin which can be detected when electronically scanned by coin-counting or payment machines.


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A Legendary New Coin – The Little John £5

Every leader needs a loyal lieutenant, and that’s exactly what Little John was to Robin Hood in the English folklore story. The third and final coin in the Robin Hood Collection features none other than the towering warrior himself, Little John.

2024 UK Little John £5

A powerful design

The reverse design, by Jody Clark, shows Little John standing tall amongst the trees of Sherwood Forest, quarterstaff in hand. John was was known to be a master of the quarterstaff, a traditional European polearm dating back to the mid-16th century.

The design is actually taken from the 2022 Little John Bullion coin, which was part of the Royal Mint’s Myths and Legends bullion mini-series.

2024 UK Little John £5 Reverse and Obverse

To highlight the dynamic design, your 2024 UK Little John £5 has been struck to a Brilliant Uncirculated quality – the standard favoured among collectors.

Who is Little John?

Little John appeared in some of the earliest versions of Robin Hood ballads and stories – some dating back to the 15th century! He is predominantly known as Robin Hood’s chief lieutenant and second in command of the Merry Men.

Sometimes depicted as nearly 7 foot tall and incredibly brave and strong, “Little” John gained his ironic nickname in reference to his large frame.


Robin Hood and Little John from the cover of the1912 novel Bold Robin Hood and His Outlaw Band: Their Famous Exploits in Sherwood Forest.
Robin Hood and Little John from the cover of the 1912 novel Bold Robin Hood and His Outlaw Band: Their Famous Exploits in Sherwood Forest.
Image Credit: Louis Rhead, Public domain, via Wikimedia Commons

Little John has been portrayed in countless ballads, literature, plays, TV shows and films, but it was in a 17th century Robin Hood ballad, where John and Hood’s first meeting was described in most detail.

Little John tried to prevent Hood from crossing a narrow bridge, whereupon they fought with quarterstaffs, and Robin was overcome. Despite having won the duel, John agreed to join his band and fight alongside him – this is now the most popular explanation of how the two outlaws met.

Previously in the Myths and Legends series…

The 2024 Little John £5 coin is the final coin in the Robin Hood Collection, which has previously featured the Robin Hood £5 and the Maid Marian £5.

Robin Hood £5 Collection
Robin Hood and Maid Marian

Prior to the Robin Hood Collection, the first three coins in the Myths and Legends series focused on Arthurian Legends. The series kicked off with the King Arthur £5, followed by mythical wizard Merlin and concluded with shapeshifter and witch, Morgan Le Fay.

Arthurian Legends £5 coins 
King Arthur, Merlin and Morgan le Fay
Arthurian Legends £5 coins
King Arthur, Merlin and Morgan le Fay

The Myths and Legends £5 series has united minting excellence with timeless legends of British folklore, featuring some of the most legendary mythical characters ever.

Do you have any of these coins in your collection? And what legend or folklore story would you like to see feature on UK coins? Let us know in the comments below!


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So you think you know the Kew Gardens 50p?

The rarest 50p in circulation for 15 years, the 2009 Kew Gardens 50p, is at the top of many collectors’ wish lists, but how well do you actually know this elusive coin?

Kew Gardens 50p
The 2009 Kew Gardens 50p is now the second rarest 50p in circulation

Extremely low circulating mintage

Most collectors will know that what makes the Kew Gardens 50p so sought-after is its incredibly low mintage figure of just 210,000! That’s nearly 7 times less than the next rarest circulating 50p – the 2018 Peter Rabbit 50p.

However, in October 2023, the Kew 50p was knocked off the top spot as the rarest UK 50p and replaced by the 2023 Salmon 50p, which has a circulating mintage of just 200,000!

2023 Salmon 50p
The 2023 Salmon 50p is now the UK’s rarest 50p with just 200,000 in circulation

With 1.5 billions 50ps in circulation since 1997, that means Kew Gardens 50ps make up just 0.013% of all circulating 50ps!

50p Mintage figure chart - Kew Gardens 50p
The latest mintage figure chart shows the Kew Gardens 50p as the second rarest

A question we were asked recently is ‘Why were so few Kew Gardens 50ps put out into circulation?

The answer is simple – demand for the 50p denomination was not high at the time when the Kew Gardens 50p was released into circulation. But why…

Banks, cash centres and the Treasury forecasted demand for coin denominations and had put their order in with The Royal Mint for 2009 coins. The Royal Mint started minting the Kew Gardens 50ps, but as the forecast was reduced, minting had to be stopped after just 210,000 had been produced. So the 210,000 2009 Kew Gardens 50ps we have in circulation today were originally just the start of a much bigger order.

Another factor which could have contributed to the forecast being reduced is the huge amount of 50ps which went into circulation the year before – a whopping 26,247,000!


How to spot a fake Kew Gardens 50p

Unfortunately, this level of attention and popularity can cause problems, and some unlucky collectors fell pray to buying fake Kew Gardens 50ps on the secondary market.

Luckily, there are some easy ways to identify an authentic Kew 50p, here’s what to look out for which could indicate a fake:

  • Frosted finish on the pagoda and years
  • High relief design
  • An extra pointy roof on the pagoda
  • The Queen’s neckline alignment
  • Larger designer initials
  • More rounded features on Queen Elizabeth II’s portrait
  • Lighter than a standard 50p (8 grams)
Kew Gardens 50p fakes

Design difference

It’s often thought that two extra lines either side of the word ‘Kew’ at the bottom of the design is another sign of a fake Kew Gardens 50p, and whilst this can indicate a dodgy copy, these lines do actually appear on the Brilliant Uncirculated and Proof versions of the coin.

Brilliant Uncirculated and circulation Kew Gardens 50p
Brilliant Uncirculated 2009 Kew Gardens 50p (left) and Circulation 2009 Kew Gardens 50p (right)
Image credit: The Royal Mint

This is likely due to the level of detail achieved by striking proof and brilliant uncirculated coins making the lines more visible than on the circulating version.

The Kew Gardens 50p was re-issued in 2019 as part of the 50th Anniversary of the 50p celebrations, however this version was not intended for circulation and therefore also features the extra lines.

2009 Circulation Kew Gardens 50p and 2019 Brilliant Uncirculated Kew Gardens 50p
2009 Circulation Kew Gardens 50p (left) and 2019 Brilliant Uncirculated Kew Gardens 50p (right)

Did you know, coins intended for circulation are struck just once at a rate of up to 750 per minute, whereas Brilliant Uncirculated coins are struck twice with a greater force using hand polished dies at a rate of up to 300 per minute, giving much more definition. Proof coins go the extra step and are struck several times at a rate of between 50 and 100 per hour.


Potential Kew Gardens 50p Errors

Minting errors and mis-strikes can make coins more sought after by collectors and even add value. A few eagle eyed collectors have reported finding interesting variations on their Kew Gardens 50ps which could be a result of an error or mis-strike at the time of minting.

Extra ‘leaf’

One collector took to an online coin forum to share their Kew Gardens 50p which had what looked like an additional leaf at the bottom right of the pagoda. After some speculation, it was suggested that the extra ‘leaf’ may have been caused by die wear or maybe a die chip during striking.

The error resembled an extra leaf at the bottom of the pagoda
Image Credit: MrV via coincommunity.com

‘Struck thru’

A strike-through, or ‘struck thru’ error is caused by another object coming between a blank and a die at the time of striking. The outline of the object – usually staples, metal shavings, cloth fibres or hairs – is pressed into the blank’s surface.

A handful of collectors reported finding strike-through errors on the obverse of their Kew Gardens coins, one across the Queen’s cheek, the other at the top left of the obverse. Both of these have been authenticated by the Numismatic Guaranty Company as genuine errors.

Kew Gardens 50p with strike thru
A strike through error across the Queen’s cheek on the obverse
Image Credit: JackCoins1975 via eBay
A strike through error on the top left of the obverse
Credit: Mr Jibble on YouTube

Do you have a Kew Gardens 50p?

Are you one of the lucky 210,000 people to own a 2009 Kew Gardens 50p? Or perhaps you got your hands on a 2019 re-issue? Or perhaps you’re one of even fewer collectors to find a 2023 Salmon 50p in your change! Let us know in the comments!


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