The two 'rarest' 50p coins worth almost £200 – expert reveals how to spot Combined these pieces could be worth almost £200 to collectors – far more than their face value. An expert revealed two 50p coins that are especially rare and sought after by collectors (Image: Getty ) A coin expert has highlighted two of the UK's "rarest" 50p coins that could fetch a tidy sum for collectors – potentially up to £200 combined, which is significantly more than their nominal value. The specialist, who goes by the name the Coin Collecting Wizard on the popular social media platform…