An expert has urged Brits to keep an eye out for a “rare” and “valuable” 50p coin worth far more than its face value. A specific version of this 2011 coin could sell for as much as £2,000. According to the Coin Collecting Wizard , an expert who shares advice online, the coin you want to get your hands on is part of a collection to commemorate the 2012 Olympics in London. Known as the “aquatics” coin it features a swimmer wearing goggles and a cap. However, only the earliest versions of the coin are particularly valuable. These could fetch up to £2,000 at auction. The expert said: “The Olympics Swimming 50p is one of the most famous and valuable modern UK coins with a rare version fetching up to £2,000. Released in 2011 as part of the 29-coin London 2012 Olympic series the original design featured a swimmer with water lines running across their face to represent the pool surface.” If your coin depicts these water lines you are in luck. “Shortly after production began the Royal Mint decided the lines obscured too much detail and redesigned the coin so the swimmer's face was clearly visible,” he continued. “Only around 600 of the original water lines version were released before the change making it one of the lowest mintage 50p coins ever to enter circulation. Its extreme rarity coupled with its unique design quirk has turned it into a holy grail for change hunters. “If you find one in your pocket you could be holding a coin worth thousands. So remember, the normal version - just 50p - but lines over swimmer’s face, then you just made two grand.” At the time of reporting, the Britannia Coin Company has an uncirculated version of this coin listed for £3,995. The website details: "These coins are eagerly sought by coin collectors and the 2011 aquatics coin, designed by Jonathan Olliffe, is already a fairly rare release. "In the more common version of this BU 50p the face of the swimmer is clearly visible under the swimming pool waters. In this rare variation watery lines appear across the swimmers goggle-wearing visage. Supposedly only 600 of these ‘lines across the face’ “Aquatics 50ps were issued before the design was changed making them the rarest base metal 50p ever released."