The Royal Mint has unveiled its first bullion coin to bear the portrait of King Charles, a piece struck in fine gold and enhanced with security features.
Below Britannia's flowing gown, a trident becomes a padlock as the viewer changes their perspective.
Surface animation on the coin reflects the movement of waves.
These added security features both decorate and protect the coin, the Mint said.
Micro-text that borders the design states "Decus et Tutamen", which translates as "An ornament and a safeguard".
A 1oz fine gold bullion coin was on sale on the Royal Mint's website on Monday for around £1,700.
Andrew Dickey, director of precious metals at the Royal Mint, said: "While the design of the bullion Britannia coin remains consistent, the 2023 dated edition begins a new chapter for Royal Mint bullion coins, as His Majesty the King's portrait appears for the very first time.
"Bullion coins are an attractive option for many investors looking to diversify their investment portfolio."
Britannia coins can be purchased from the Royal Mint's website.
The bullion comes after the first coinage featuring King Charles was introduced last month. The coin bearing the 74-year-old monarch's image reflects a transition from the Elizabethan age of the late Queen Elizabeth II to the Carolean era of Charles, with the coin also commemorating the life and legacy of the Queen on its reverse.
Most recently, a 50p coin celebrating 75 years of the NHS was among the first commemorative coins of 2023 to bear the King’s official coinage portrait.
All new Royal Mint coins struck from 1 January 2023 will bear Charles’s portrait.