The new 12-sided £1 coin makes its way into circulation today and it has a hidden security feature which makes it much harder to counterfeit.
It has been suggested that it could be to do with a material inside the coin itself which can be detected when scanned electronically by payment machines.
Royal Mint have still not released any further information.
People are trying to figure out what it could be and have taken to Twitter to give their suggestions.
— ITV2 (@itv2) March 28, 2017
#poundcoin the secret ingredient of the new pound coin is that it is not worth very much
— malsimon❄ (@opheliasbrother) March 28, 2017
The new one pound coin will contain a security feature so secret they won't tell you what it is so you won't know if you get a fake one https://t.co/8gb0EKUiGY
— The Longest One (@thelongestone) March 27, 2017
Discussing the new pound coin with the boy. He's decided the hidden security feature is that each coin contains a tiny police officer.
— Hippyjim (@hippyjim) February 26, 2017
Other security measures which have been released include a hologram-like image and micro-sized lettering.
Royal Mint claim that the new pound coin will be the “most secure coin in the world.”
“It’s been designed to be fit for the future, using security features that aim to safeguard our currency, and currencies around the world, for years to come,” said Adam Lawrence, chief executive of the Royal Mint.
But when do you have to have spent your old £1 coins by?
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