UK banknotes adorned with a portrait of His Majesty King Charles III were first introduced on June 5, 2024.

The image of the King graces all four denominations – £5, £10, £20 and even the £50 note. Since launching into circulation, millions of Brits have been keen to get their hands on the currency featuring the new monarch.

But did you know that certain notes could fetch far more money than their face value?

You'll need to keep a sharp eye out for specific serial numbers which could see these notes command a hefty price at auction. One TikTok user, known as @CoinCollectingWizard, shared with his 186,400 followers the type of paper to watch out for.

He disclosed how one note with a particular serial number is valued at £650.

In a recent video, he stated: "Do you want to know about banknotes worth big money? New banknotes featuring King Charles are out in the wild, ready for you to find and check those serial numbers for anything a bit different.

"The King's portrait will be the only change to existing designs of £5, £10, £20 and £50 notes. And new notes will replace damaged or worn older ones.

"Coins featuring the King are already found in people's change, but banknotes required lots of preparation. Shoppers can and will still be able to use Queen Elizabeth II banknotes. Low serial numbers on notes are of huge interest to collectors.

"They will be sold during the summer at auctions. In addition to the auctions, members of the public will be able to enter a ballot to purchase a set of notes. The money raised will be donated to charity."

Also in the video, he showcased three banknotes as examples, urging followers to look out for specific serial numbers.

One such note, a £5 bill with the AK47 serial number, could fetch up to £650. An AA01 number on a tenner might net you £89, while '888888' on a fiver could pocket as much as £150 at auction.

It's advisable to get professional advice if you come across any of these notes before heading to an auction.

The shared video gained attraction with 150 likes and comments from amazed fans. Typically, viewers would claim ownership of such banknotes, but this time, a slew of users responded with "laughing" emojis, taking a lighter view of the find.