Your data will be processed in accordance with our Privacy policy The risks of investing in coins This newsletter delivers free money-related content, along with other information about Which? Group products and services. There are coins that sell for more than this, but there's a big step down from the Kew Gardens 50p to its nearest rival, the Olympic football 50p which sells for just over £10. Despite their rarity, these coins appear to generally sell for just over £1 on eBay. Though tens of millions of them have been minted in other years, only 1.8 million were minted two years ago. The second-rarest by mintage is the fairly innocuous 2017 Royal Shield 50p. The coin itself is in high demand from collectors, and it can sell for over £100 online. Only 210,000 were minted, in contrast to the millions that are minted for most designs. Originally minted in 2009, people didn't realise how scarce this coin was until circulation figures were revealed years later.
Though many of these coins were popular, not all of them are considered among the rarest.
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