The Museum is home to a spectacular series of gold and silver trial plates dating from 1477, these plates being the officially approved standards against which the composition of coins can be independently checked by comparative assay.
Browse highlights of the trial plates collection below.
Assayers’ trial plates show the extent of the debasement that took place during the reign of Henry VIII.
A debate over which is the earliest surviving trial plate has centred on this object.
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Since at least 1282, coins produced by the Royal Mint have been checked at the Trial of the Pyx.
Newton took an active interest in mint affairs.
In 1978 a previously unnoticed draft Grant of Arms to the Royal Mint was discovered.
A key figure in the history of the Royal Mint.