Probably from the British Monarchs collection, this is a 2023 issue unit  

No monetary value assigned to this coin. 

On one side, the legend - King Charles III God save the King  1/200oz fine gold National anthem of the United Kingdom 

The other side  - Thy choicest gifts in store, on him be pleased to pour  Long may he reign. May he defend our laws, and ever give us cause to sing with heart and voice.  God save the King.  

Is contained within a magnetic perspex cover, which can be opened of course and has a small plastic stand to display the item   

The COA indicates that this is part of a set, of which the maximum issue is 5000, this one was number 19.   1/200 oz, 2023, 40mm, proof, gold .999  . 3rd verse and God save the King