A British coin collector has pocketed a 20p piece so rare that it's the only one experts have ever seen – and is worth over £2,000.

Alun Barker, 43, is thought to be the only person known worldwide to be the keeper of an ultra rare 1990 20p, after he bought it for £50 on eBay.

What makes it unique is the type of metals the coin was made from when it was created by The Royal Mint three decades ago.

Rather than being produced with a bronze metal blank, known as a planchet, like every other 20p made in 1990, this coin was struck on a planchet from a foreign country.

He's been told by experts his coin is the only one known to be in existence, and if sold, would fetch a minimum of £2,200 at auction.

In January 2018 the coin was verified as authentic by the Royal Mint, who have confirmed it as genuine coinage.

After conducting his own research online, Alun soon realised just how rare his coin is and so sent it off to experts in America for a second opinion.

The experts in America confirmed it is a mix of foreign metal – a copper plated steel blank – and UK coinage and is also in almost perfect condition.

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20p coin turned out to be worth £2,000(https://metro.co.uk/2019/01/28/20p-coin-turned-worth-2000-8403132/)