A rare 20p coin that may be the only kind could sell for as much as £1,800.The unique coin was struck on a plain metal disc planchet from a foreign country in 1990 instead of being produced using a bronze metal blank like most 20p coins made that year.Collector Alun Barker is believed to have purchased the coin on eBay for £50 in December 2017.It was initially listed as a 20p strike on a 1p coin...
The rare 20p coin that could be worth £1,800
T