Like many other mints, the Royal Mint issues bullion coins in precious metals, having much higher intrinsic value than their face value. The quarter ounce (1/4 oz) gold coins are denominated as Twenty-five Pounds (£25).
The coins are legal tender but are not intended for circulation. They are targeted at bullion investors or collectors who appreciate the special editions as pieces of art. The coins are typically "one-year" types usually issued in parallel with other denominations with the same reverse designs.
This gold quarter-ounce coin denominated as £25 is part of the Tower of London Collection coin series by the Royal Mint.
The Royal Mint says:
Founded by William the Conqueror almost 1,000 years ago, the Tower of London is one of the world’s most famous fortresses. Guarding the Tower and protecting the traditions and treasures held within its walls are the Yeoman Warders. The walls of the fortress may be steeped in history but it’s safe to say that many come to catch sight of, or maybe take a picture with, the famous Yeoman Warders in their iconic red uniforms.
These distinctive guards appear on the third coin in The Royal Mint’s series exploring the Tower of London. The Yeoman Gaoler takes pride of place on the coin, instantly recognisable in his Tudor bonnet with ceremonial axe. | 
Search for United Kingdom: Gold Quarter Ounce 2019 Yeoman Warders on eBay 
