Chris Yang, co-founder of Coins Value, previously told the Mirror: "This is one of the rarest British coins because only a few were ever produced as part of a special minting for record-keeping.

If you have a rare coin and you're unsure of the authenticity or value of it, you can get in touch with the Royal Mint's team of experts.

and allows space for decorative pictures. 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 ...

Rare coins could be worth hundreds of times more than their face value, as one person found out when they sold a 20p coin for more than £230 on eBay.

Check your change and take a look down the back of the sofa after a rare Royal Mint 20p coin sold for 450 times its face value this week. The 20p piece is a “mule” coin dating from 2008 and was minted ...