Error 50p coin with 'unusual mark' worth 90 times more than face value

Some coins can be more exciting than others. That's because certain rare coins hold important value, from the one penny coin named the rarest in the UK to a super valuable piece worth thousands.

That said, collectors are always urging Brits to check their change for any hidden gems. Now Instagram user @CoinCollectingWizard often shares the designs you need to look out for with his 30,900 followers. Recently, he wasted no time in forming his fans of a 50p coin which bears an 'unusual mark' that makes it worth more than 90 times its face value. So do you have this piece?

Discussing the 2017 Sir Isaac Newton 50p, the expert claimed this piece is a "collector's gem".

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He said: "Released in 2017 as part of the UK's 'Innovations in Science' series, the Sir Isaac Newton 50p coin celebrates the groundbreaking work of one of history's greatest scientists."

The coin collector then detailed a number of key facts about the 50p.

Firstly, this 50p has about 1.8million in circulation which makes it one of the rarest coins of its kind.

As for the design, the reverse features Aaron West's work, depicting elements from Newton's Philosophiæ Naturalis Principia Mathematica, including an image of Newton's reflecting telescope.

When it comes value, in circulation condition it's worth just £2.50, meanwhile Brilliant Uncirculated condition can fetch for about £6.

But that's not the juicy bit.

Some of these 2017 Sir Isaac Newton 50p coins have been discovered with a dye clash error.

Speaking about the flaw, the Instagram user said: "[This] results in extra lines across Queen Elizabeth II's portrait.

"These error coins are highly sought after by collectors and can be worth significantly more – up to £45 or more, depending on the severity of the error and condition.

"Tip: Always check your change carefully! If you find a 2017 Sir Isaac Newton 50p with unusual markings, it could be a valuable error coin."

If you ever suspect your coin is a little bit more special than usual, always seek professional advice.

Experts can confirm whether the piece is worth a lot of money, or if it's a fluke. Furthermore, they can advise you on how much it could sell online if that's your plan.

So think you have one of these coins? Let us know in the comments section.