Union Jack: 2018 U silver 10p coin

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If you're a coin collector or a silver stacker, you probably already know how addictive The Royal Mint's Great British Coin Hunt can be. But while most people were busy checking their loose pocket change for the standard 10p coins back in 2018, serious collectors were quietly eyeing something way more special: the premium Silver Proof edition. The "Letter U" coin from this A-Z lineup is a total standout. Instead of the usual base metal, this beauty is struck in solid .925 sterling silver, weighing in at a satisfying 6.50g. Because it's a proof coin, it gets a special slow-minting treatment that gives it an incredibly sharp, frosted design resting against a flawless, mirror-like background. It’s the kind of coin you strictly handle with cotton gloves.

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The design itself is a really clever nod to British heritage, bringing a bit of national pride right into the palm of your hand. On the reverse side, the capital letter "U" seamlessly weaves into a beautifully textured, rippling Union Flag. It's a simple but powerful visual that stands for the unity of the UK. Flip it over, and you'll find the classic fifth portrait of Queen Elizabeth II by Jody Clark. Beyond just looking great in a display case, that royal portrait means the coin holds official legal tender status in the UK. For British investors, that's a huge bonus because it makes the coin completely exempt from Capital Gains Tax (CGT), giving you a tax-free way to hold physical silver.

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What really makes the Letter U a prize for collectors today is just how tough it is to find. While the circulating 10p coins got a re-release the following year, The Royal Mint strictly kept the Silver Proof series as a one-time 2018 exclusive. They capped the worldwide release at just 15,000 pieces per letter, which is a tiny number when you think about how many people want to spell out their names or initials. Finding one fully encapsulated with its original certificate on secondary sites like the Britannia Coin Company is getting harder by the day. It’s the perfect mix of a fun cultural collectible and a genuine precious metal asset.