The 20p piece is a rare “mule” coin dating from 2008, and fetched £90 at auction. The coin was minted without a date due to an error and quickly became a sought-after collector’s items.

the 20p coin sold for £90. 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.

From the famous Atlantic Salmon and Kew Gardens 50p to a desirable 10p series and the first coins to feature King Charles, ...

ONE rare detail to spot on a 50p coin reveals whether it's worth up to £250. Rare coins can be found in your spare change and are sometimes worth a small fortune. Generally, a piece will be ...