Is this a new £1 minting ‘error’?!

Last year we reported on the ‘Dual-dated £1 coin error’ where the dates on the obverse and reverse were different, one reading 2016 and the other 2017.

Now another £1 coin ‘error’ has been discovered and this one is very interesting indeed! It would appear that a 12-sided £1 coin die has been struck on an old round £1 coin blank.

The latest £1 ‘error’ coin appears to be a 12-sided £1 die struck on an old round £1 coin base. (Image: Zeki Atma)

In the past week alone, we’ve seen 3 examples of this ‘error’ coin.

The first was from a Change Checker from Burnham-on-Sea who told us that they’d listed the coin on eBay. After receiving 22 bids, the coin sold for £205! 

One of the first examples of this ‘error’ coin has sold for £205 on eBay!

Another coin is being sold at an auction in London on Wednesday 21st February. The auctioneers, ‘Timeline’, who are based in Berkeley Square, describe the coin as an “exceptional modern rarity” and go on to say “…the coin is sure to attract much attention when it crosses the block later this year”.

Another example of this latest ‘error’ will be available to purchase at auction on the 21st February. (Image: Coin news)

The third report we have received was this morning from another Change Checker. Our advice to anybody who believes they have found this coin, or any other ‘error’ coins, would be to send the coin off to The Royal Mint Museum who offer a free verification service.

They will send the coin back to you with confirmation of their findings, which can take a few weeks depending on demand for the service. Here is the address:

Dr Kevin Clancy, Director of the Museum, The Royal Mint Museum, Llantrisant, Pontyclun, CF72 8YT

As yet, we have not seen proof that these coins have been verified by The Mint, so whilst they look genuine we will keep an open mind for the time being.

As usual, if you think you have found one of these coins or any other interesting ‘errors’, we’d love to hear from you.


  1. Vivienne Lord on February 26, 2018 at 7:38 pm

    Hi Luke, (sorry if this is a silly question). re: The standard Technology £2.00 coin, has the writinf round the coin ever been changed in size plz? I have a lovely condition 2013 one but the writing is massive compared to my 2005 one.
    Many thanks.

    • Luke Hearn on February 27, 2018 at 1:32 pm

      Hi Vivienne, The design has not been amended so each coin should be uniform (barring the occasional mis-strike). Please feel free to email a photo to [email protected] and i’d be happy to take a look at it for you. Thanks Luke

  2. Billy Thomson on February 26, 2018 at 5:48 pm

    Hi, I have just come across a new £1 coin that was featured in you Jan 31st article with 12 sides on one side of the coin but round on the other. It said in the article that 3 that you knew of had been found and there are currently 2 on ebay. Do you know if any ever got authentication from the royal mint? Many thanks.

    • Luke Hearn on February 27, 2018 at 1:30 pm

      Hi Billy, thanks for your message. as far as I am aware, none have been officially verified by The Royal Mint. Thanks Luke

  3. Chalky on February 10, 2018 at 4:53 pm

    I have a Charles dickens with the writting on the edge upside down like I read in the express. Is there any other details I need to look for to authenticate it is a mint error? It is 2012

    • Luke Hearn on February 12, 2018 at 8:22 am

      Hi Chalky, This is actually a common misconception. The outer writing is applied at a different time to the two faces, therefore it’s pot luck which way around the writing will be. Thanks Luke

  4. Steph on February 9, 2018 at 8:10 pm

    I have a £2 Charles Darwin coin where the inner ring is the reverse way round. So the faces of darwin and chimp are on the side where the queen should be and vice versa the queen on the side where Darwin should be. Guess this is a rare mule?

    • Luke Hearn on February 12, 2018 at 8:23 am

      Hi Steph, this certainly sounds interesting. If possible, could you email a couple of photos to [email protected] and we’d be happy to take a look at this for you. Thanks Luke

      • Steph on February 12, 2018 at 9:25 am

        I’ve already done that. Thanks

  5. Paul on February 8, 2018 at 9:40 pm

    Hi what a find and believe me I’ve found a printing stamped error on the back of the coin where Elizabeth is the L on my coin is stamped into a D so I thought I’d like to share with you with my great find today

  6. Danne on February 7, 2018 at 9:54 am

    Hi I have a 20p where the metal has extra on the face? And queen looks like she has headphones on!
    Any ideas worth?

  7. Laura Jane Tomkins on February 5, 2018 at 7:17 pm

    Hi I have 2 £2 coins 1605-2005 gunpowder plot and a suffragettes £0.50 pence piece dated 2003 for the 1903 start of the fight for women to be able to vote,are these coins of any value please.thank you

    • Luke Hearn on February 6, 2018 at 1:51 pm

      Hi Laura, I would suggest having a look on eBay at ‘recently sold’ items, that way you should get an accurate value for your coins. Thanks Luke

  8. Richard Goode on February 2, 2018 at 1:24 pm

    I have a new £10.00 note with the first letters being AA and numbers 11 is this worth anything?

  9. Declan on February 2, 2018 at 1:16 pm

    Hi, I have a 2, 12 sided one pound coins. With the date 2016 on them.
    I also have 2, 12 sided one pound coins with the dates 2017 on the both of them.
    They all look the same only for the dates.
    Are they wort anything?

    • Luke Hearn on February 2, 2018 at 2:01 pm

      Hi Declan, these would be worth face value, they have different dates as they were struck in different years. Thanks Luke

  10. Rebecca D Jones on February 2, 2018 at 7:51 am

    Good morning.
    I have a few 12-sided one pound coins, where the 1/£ hologram doesn’t appear to be clear. Is this a printing error or just my eyes?
    Any advice welcome.
    Many thanks!


    • Luke Hearn on February 2, 2018 at 8:05 am

      Hi Rebecca, obviously i haven’t seen the coins but this would sound like a slight mis-strike rather than an ‘error’. Thanks Luke