Coin Info
How are your coins Quality Assured? The Trial of the Pyx!
As Change Checkers, we love it when new coins are issued. But how are they quality assured? And what processes do they have to go through before ending up in our collections or our pockets?
Since 1282, an independent procedure called the Trial of the Pyx has been responsible for ensuring that newly minted coins (both circulating and commemorative) meet the legal specifications for weight, size and metallic composition. The process takes place annually and can take 2-3 months to complete, but how exactly does it work?
Credit: Matt Brown, CC BY 2.0, via Wikimedia Commons
Phase 1: The Opening
After striking, The Royal Mint randomly selects coins from each batch of denominations to be quality assessed. These coins are sealed in bags of 50 and stored in Pyx chests until the day of the trial.
On the day of the opening ceremony, the Pyx chests are transferred to Goldsmith’s Company Hall in London. The ceremony is presided over by the senior judge in the Court of Justice, the King’s Remembrancer, giving the trial the status of a Court of Law.
Credit: Firebrace, CC BY-SA 4.0, Wikimedia Commons
Did you know? The word Pyx comes from the Latin word ‘Pyxis’, meaning small box.
The trial jury, which is made up of Liverymen and more senior figures of the Goldsmiths’ Company, open each sealed bag of coins and place 1 into a copper bowl for testing by the London Assay Office, the remaining 49 are placed into a wooden bowl to be weighed.
Phase 2: Testing
The coins selected for testing are sent to the Assay Office where they are compared against a Trial plate. These metal plates, made of gold, silver, platinum, nickel and zinc, are held at the National Measurement and Regulation Office. The oldest surviving Trial plate, from 1477, resides in The Royal Mint Museum.
Credit: The Royal Mint
Next, the base metal and precious metal coins are separated, with the base metal ones going through X-Ray fluorescence spectrometry, and the precious metal ones sent for laboratory chemical testing. The main purpose of these tests is to break down the coins’ composition to check their metal content meets specifications.
Phase 3: Verdict
After rigorous testing, the Assay Office decide if the coins meet all specifications set out in the Coinage Act or by Royal Proclamation. Their recommendations are passed to the Senior Master and the King’s Remembrancer, who instruct the Goldsmiths’ Company.
Credit: The Goldsmiths’ Company
The final verdict is delivered to the Chancellor of the Exchequer or their deputy and the Deputy Master of The Royal Mint.
The oldest judicial procedure in the country
The Trial of the Pyx dates back as far as the 12th century, making it one of the oldest judicial procedures in the country. As such, should the coinage be found to be substandard, the punishment for the Master of the Mint would be a fine, removal from office or even imprisonment!
Luckily however, modern coin production processes have become far more reliable, therefore the last Master of the Mint to be punished was Sir Isaac Newton in 1696. Newton was, of course, celebrated on the Sir Isaac Newton 50p in 2017, a coin that quickly become popular with collectors. Find out what makes this coin so interesting >>
Did you know about this process? Or perhaps you’ve been lucky enough to attend the trial as a spectator? Let us know in the comments below!
The ‘enchantress of numbers’ celebrated on a UK coin – Ada Lovelace £2
A brand new £2 coin has just been issued, paying tribute to English mathematician and writer, Ada Lovelace. This new UK £2 coin is the 9th coin in The Royal Mint’s Innovation in Science series, which has previously featured coins dedicated to Stephen Hawking, Alan Turing, Edward Jenner and Alexander Graham Bell.
A discoverer of the hidden realities of nature
The Innovation in Science series has mainly comprised of 50p coins, however the 2023 UK Ada Lovelace £2 will be the third £2 in the series. It’s also only the second time a female has been celebrated on an Innovation in Science coin, preceded only by the 2020 Rosalind Franklin 50p.
The reverse design of the Ada Lovelace £2 by Osborne Ross takes inspiration from the original input cards used by Lovelace to programme the Analytical Engine, along with the inscription “a discoverer of the hidden realities of nature”. The quote is a self declared statement taken from a letter that Lovelace wrote to her mother.
Credit: Alfred Edward Chalon, Public domain, via Wikimedia Commons
The ‘enchantress of numbers’
Lovelace worked closely with Charles Babbage, who also featured on an Innovation in Science coin, on his Analytical Engine and saw limitless potential in the computer. She studied the technology meticulously and discovered there was much more to computers than just calculating mathematical equations. This lead to her being referred to as the first computer programmer. Charles Babbage himself even gave her the nickname the ‘enchantress of numbers’.
The 2023 Ada Lovelace £2 pays homage to Lovelace’s tenacity and her life as a visionary. The edge inscription of this coin reads ‘INNOVATION IN SCIENCE – LOVELACE’, reinforcing its ties to the other coins in the Innovation in Science series.
Secure yours 2023 UK Ada Lovelace CERTIFIED BU £2
Don’t miss out on adding the latest Innovation in Science coin to your collection. Click here to get yours >>
How much are your coins worth? June 2023 eBay Tracker update!
Good news Change Checkers – your latest eBay Tracker and Valuation Index is here!
Whilst the secondary market can be a bit of a minefield, we’ve put together an easy way for you to see how much the Top 10 UK coins and banknotes are selling for right now.
eBay Tracker
Find out which coins and notes have been the key movers and in our latest eBay Tracker update.
After a spike in selling prices in our last update in January 2023, most likely due to the new King Charles III coins, things are starting to level out again. Although there has been an overall decrease in prices, there are still some noteworthy changes since our previous update.
Olympic Football 50p
The coin that’s seen the biggest increase is the Olympic Football 50p. The Olympic 50ps have long been favourites amongst collectors, but did you know that only 1,125,500 Football fifty pence pieces entered circulation? It’s definitely the rarest Olympic 50p to look out for and tops our chart as having the smallest mintage figure, which means it is even harder to find than the other Olympic 50ps.
With a design explaining the hotly debated offside rule, it definitely sparked discussion among collectors and football fans alike.
Kew Gardens 50p
Released by The Royal Mint in 2009 to celebrate the 250th anniversary of the Royal Botanic Gardens at Kew, the striking design of this 50p, by Christopher Le Brun RA, features the famous Chinese Pagoda at Kew, entwined by a decorative leafy climber.
In 2014, The Royal Mint revealed that only 210,000 Kew Gardens 50p coins had been struck, making it the scarcest UK coin in circulation. And nearly 10 years later, people are still willing to pay hefty sums to get their hands on one. Some have sold on the secondary market for nearly £200!
Valuation Index
Since coins bearing King Charles III’s effigy began circulating, collectors have been keen to complete their Queen Elizabeth II collections.
This is reflected in the coins and bank notes being sold on the secondary market, some still selling for several times their face value.
Undated 20p
Considered by some the holy grail of change collecting, the undated 20p is being snapped up for a pretty penny recently.
These illusive coins have sold on the secondary market for more than 25 times their value! It’s not known how many are in circulation, but most serious collectors have it on their wish lists.
My coin isn’t on the eBay Tracker
The eBay Tracker follows the movements of the Top 10 UK coins and banknotes, however if your coin doesn’t appear on the tracker you can use our 6 point guide to help determine the realistic value for your coin.
How does the eBay Tracker work?
The Change Checker eBay Tracker takes the last 9 sold prices on eBay and gives the median price achieved (rounded to the nearest 50p). By taking the median, rather than an average, we avoid skewing figures with one or two excessive prices.
Please note that the Change Checker eBay Tracker is only ever designed to be a guide as to prices achieved on eBay. Prices may vary depending on collector demand and the quality of the coin being sold. It does not provide any guarantee as to future values of coins.
If you’re interested in coin collecting, our Change Checker web app is completely free to use and allows users to:
– Find and identify the coins in their pocket
– Collect and track the coins they have
– Swap their spare coins with other Change Checkers
Share, learn & swap with the Change Checker Community
Join the only official Change Checker Facebook group today >>