Coin collectors might be in possession of a hidden fortune if they have a specific coin in their collection. A TikTok user, @coincollectingwizard revealed a pre-decimal UK coin with a mintage of only 166,000, which could be worth up to £9,000 in uncirculated condition. The British half crown, first issued in 1549, contains 92.5% silver, adding to its value. Even in less-than-pristine condition, this coin can still fetch hundreds to thousands of pounds. Additionally, other rare coins to watch out for include the Kew Gardens 50p, which sold for £6,800 at a Royal Mint auction, and a rare 2p from 1983. So, check your coin collection and see if you have any of these hidden treasures.