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flag A 2017 50p coin with Sir Isaac Newton can be worth up to £45 due to a rare dye clash error.

flag A rare 2017 50p coin featuring Sir Isaac Newton is worth up to £45 due to an "unusual mark" on some coins, making it worth nearly 100 times its face value. flag Part of the UK's "Innovations in Science" series, the coin's value increases significantly if it has a dye clash error, seen as extra lines on Queen Elizabeth II's portrait. flag About 1.8 million are in circulation, making it one of the rarest of its type.

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