Brits urged to check £1 coins as error means they could be worth £2,500

Check down the back of the sofa!

According to the expert, some £1 coins could be worth as much as £2,500 because of an error on the coins.

To work out if you've got one of these valuable coins, you need to check whether the pound has two different dates on it.

The first date is on the same side as the monarch's head, but the other might be slightly trickier to spot.

You'll need to look on the rim of the other side of the coin where the date should be etched in very small print.

Usually, these two dates match, but if they're different, you might be in luck. More specifically, you're looking for dates in 2016 and 2017.

In a video on TikTok, one expert, called The Coin Collector UK, explained what you should be looking out for.

He said: “£2,500 if you manage to find this error on your 12 sided £1 coin.

“There are a few errors that can be found on your £1 coins. The main ones you want to be looking for is the dual dated £1 coin.”

Using a pound coin from 2016, he pointed out where the all-important dates are.

“So you can see, when we flip this over on the obverse side this is a 2016 version of the £1 coin,” he said.

“However some were made with the micro-lettering on the side with the date 2017. It is an extremely rare error. We only know of one that’s actually being sold to a buyer in Spain, and this sold for £2,500.”

He continued: “Here's a close-up of exactly all you want to be looking out for. You can see here the date 2017 around the edge in micro-lettering on every side.

The lettering is so small for the date around the edge though that you will "definitely" need a microscope to see it.

The expert continued: “The micro-lettering on the edges is extremely fine and very hard to see.

"Definitely worth checking if you have the 2016 dated coin on the Queen's head side, for the micro-lettering on the reverse side for the date 2017.”