One of the rarest is the Kew’s Garden 50p, which was designed to mark the 250th anniversary of the gardens in 2009. Only 210,000 coins were ever minted with this design. The Kew Gardens 50p sells for ...
It has often been used to celebrate big events over the past 50 years of British history. The rarest coins tend to be of the greatest value, with the mintage (number of coins with each design made) ...