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The 2021 Britannia Gold Bullion One Ounce Coin redefines security in the bullion market. Created by the team behind the United Kingdom’s 12-sided £1 coin (dubbed the ‘world’s most secure coin’), Britannia has evolved once more to spearhead the best security technology available and lead the way as the most visually secure coin in the world. Philip Nathan’s award-winning Britannia design from 1987 depicts an enduring symbol of a nation, boldly standing beside a shield that bears the Union flag, a symbol of Britain’s strength, and holding an olive branch representing peace. Philip Nathan’s Britannia is as beautiful as ever, struck in 999.9 fine gold and enhanced with four new features. In the lower left-hand of the design, below Britannia’s flowing gown, is a trident to represent her naval history. As the viewer changes their perspective this trident becomes a padlock, emphasizing the coin’s secure nature. Surface animation reflects the movement of waves, and fine details like the Union flag on Britannia’s shield have been carefully highlighted in the coin’s bullion finish. These added security features both decorate and protect the coin, just as the micro-text that borders the design states – ‘DECUS ET TUTAMEN’, which translates as ‘AN ORNAMENT AND A SAFEGUARD’.

These features are also available in the half-ounce, quarter-ounce, and tenth-ounce fine gold editions of the coin and in the one-ounce fine silver edition.

Key Features: 

    • Four advanced features take visual security to the next level
    • A latent image changes from a padlock to Britannia’s famous trident
    • Surface animation brings the background of waves to life
    • The micro-text provides both decoration and protection – ‘an ornament and a safeguard’
    • Britannia’s shield bears the Union flag accented with tincture lines
    • Packaged in a single coin tube


Specification Value
Denomination £100
Alloy 999.9 Fine Gold
Diameter 32.69mm
Reverse Designer Philip Nathan
Obverse Designer Jody Clark
Specification Value
Quality Bullion
Year 2021
Pure Metal Type Gold
Pure Metal Content 1 Troy Oz
Fineness 999.9
Packaging Coin Tube
Security Features Reverse reads 'DECUS ET TUTAMEN' | Latent feature trident and padlock | surface animation waves deta

Key Security Features

Latent feature

A latent feature switches between a trident and a padlock as the viewer changes their perspective, representing both Britannia and bullion security.


Tincture lines

Britannia's union flag shield, a powerful symbol of Britain as a whole, is highlighted by the tincture lines.


Micro-text next to the coin's banding reads 'DECUS ET TUTAMEN', which translates as 'AN ORNAMENT AND A SAFEGUARD'.


Surface animation

The background has surface animation reflecting the movement of the sea, which adds to the intricacy and safety of the coin.

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