Most eager numismatists know that the rarest 50p in circulation is the Kew Gardens one, minted in 2009, with a run of just 210,000.Featuring the pagoda, one can sell for a tidy sum online – up to £50, thanks to its rarity.However, this year could see an even rarer coin than that Kew Gardens one – making it worth a mint in the near future - and some are already selling online for more than £80, or 160 times face value.Last year, the Royal Mint launched a 50p coin featuring Sir Isaac Newton. It has confirmed that it will offer a 2018 version of the coin – but the only place collectors can get their mitts on one is via the Royal Mint Experience in Llantrisant, Wales.Importantly, no 2018 Sir Isaac Newton coins will be released into circulation, meaning the likelihood is that these will become rarer than the Kew Gardens coin.This is Money visited the Mint last year and struck our own 12-sided £1 coin ahead of its launch.Early birds appear to have also visited this year, as some 2018 dated 50ps are already selling on websites such as eBay for £80.That's profit of around £60 factoring in the cost to strike one and the Royal Mint Experience entry fee, a better short-term return than even cryptocurrencies which have seen a boom in the last six months.The Royal Mint adds that this only available for a 'limited time only and subject to availability'.According to the Royal Mint Experience website, striking your own coin experience is limited to one coin per person per tour, again, adding to the exclusivity. It costs £5 to do on top of the entry ticket of £13.The coin is of 'brilliant uncirculated' standard. This is described by the Mint as having a higher standard than circulating and bullion coins.An expert at blog Change Checker said: 'We're predicting that due to the short time frame and visitor numbers, there could well be substantially less than 210,000 of these coins struck, meaning the 2018 Sir Isaac Newton 50p coin could well have a lower mintage figure than even the Kew Gardens 50p.'Sir Isaac Newton enjoyed a long association with the Royal Mint – he is perhaps the most famous 'Master of the Mint.'Although the coins are only available in Wales, some may come into ownership and accidentally spend them in the future.So if you do get a coin featuring the astronomer and mathematician, check the date on the reverse.After the Kew Gardens 50p, the next lowest minted 50p coins in circulation are from the Olympic coin range, but even these have mintage figures of 1million or more.The Royal Mint recently revealed its mintage figures for 2017, which showed that the Sir Isaac Newton coin had a mintage of 1.8million, making it the second rarest 50p behind the Kew Gardens coin (excluding 2012 Olympic ones).It even has a lower mintage figure than the 2016 Jemima Puddle-Duck coin, part of the Beatrix Potter collection.This had a mintage of 2.1million and changes hands for tidy sums online as people look to complete the set of characters.
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