OnFebruary 3, 2015 both the smallest and the largest UK coins ever minted at The Royal Mint are among 70,000 coins on trial at the Trial of thePyx.

Weighing just one fortieth-ounce and measuring a delicate 8mm wide, the coin features a modern interpretation of Britannia. The imposing Kilo coinmeasures at 100mm wide and continues The Royal Mint's five-year commemoration of the centenary of the First World War.

The Trial of the Pyx is an ancient annual ceremony and is one of the oldest quality assurance trials in the world. At the Trial, samples ofcirculating and commemorative coins produced by The Royal Mint over the last year are selected at random and weighed for accuracy.

Now held at Goldsmiths' Hall, London, the Trial was first recorded publicly in 1282, and is today presided over by the Queen's Remembrancer ortheir deputy, who are amongst the highest legal representatives in the country, assisted by an independent jury of Liverymen of the Goldsmiths'Company.

During the ceremony jury members are presented with Pyx boxes (Pyx being the Roman word for chest). The coins are selected from a random selectionprovided by The Royal Mint and placed in copper bowls. The remainder are placed in wooden bowls and are then weighed for accuracy. The Trial is thenadjourned until May to allow time for trial coins to be tested by Goldsmiths Assay Laboratory and the National Measurement Office.

Whilst modern methods such as XRF (X-Ray Fluorescence) are often used in assaying, it is still only the centuries old methods such as cupellation(the fire assaying of gold) that are accurate enough in the testing of metals and therefore remain credible for checking the accuracy of the coins ofthe realm for the Trial of the Pyx verdict.

Modern legislation does not mention penalties for an adverse verdict by the Pyx jury, yet there have been stiff punishments for failure in thepast. The Master of the Mint (today a role held by the Chancellor of the Exchequer) went to prison for six weeks in 1318 and even Sir Isaac Newtonwas at loggerheads with the jury during his time as master of the Mint when the integrity of his coin samples was questioned.

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United Kingdom's smallest and largest coins go on trial(www.coinsweekly.com/en/News/4?&id=3245)