The King’s Assay Master

The History of the King’s Assay Master

More than 1,100 years of heritage, tradition and custom runs through The Royal Mint’s veins. Founded in the twelfth century, the King’s Assay Master is a centuries-old role that exists as part of The Royal Mint to this very day. As we transform and evolve as an organisation, we endeavour to preserve our traditions, authenticity and British craftsmanship.

What Does the Role Entail?

Traditionally, the term ‘Assay Master’ refers to an officer appointed to test the weight and fineness of precious metals. In today’s role, the King’s Assay Master tests the metallic components within the coinage by using modern assay techniques that are underpinned by traditional craftsmanship. Once that process is complete, the coins are independently verified at one of the oldest quality assurance processes in existence today. The Trial of the Pyx comprises a jury whose purpose is to determine the accuracy and quality of the coins. This verification process establishes whether the coins meet legal standards of weight, diameter and composition.

 The Trial of the Pyx

The Goldsmiths’ Company of the City of London, who provides an independent jury, carries out the Trial of the Pyx. The jury includes the Chancellor of the Exchequer (or a nominated representative), financial leaders, representatives of The Royal Mint, and freemen of The Goldsmiths’ Company. The King’s Remembrancer and a senior judge, who officiates at the trial in agreement with HM Treasury, swear in the trial.

Following the retirement of Graeme Smith, the prestigious position of the King’s Assay Master has been appointed to Paul Morgan, who will take on the role after a 30-year career at The Royal Mint. As Deputy Assay Master, our Technical Manager, Daniel Thomas, will support Paul Morgan as he takes on this centuries-old role.