Johnson Matthey, founded in London in 1861, is one of the world’s oldest and most famous precious metals refiners. At one stage, Johnson Matthey operated one of the biggest precious metals refining groups in the world, with operations in the UK, US and Canada.

The Johnson Matthey 10 oz minted silver bar is a highly finished silver bar containing 99.9% pure silver, and weighing 10 troy ounces or 311 grams. These minted bars are very distinctive with multiple markings and lettering on the front face.

The front of each 10 oz minted bar features Johnson Matthey’s rectangular refinery stamp featuring the JM initials and crossed hammers, above the lettering ‘JOHNSON MATTHEY’, ‘ASSAYERS & REFINERS’, ‘FINE SILVER' ‘999’, “10 OUNCES TROY” and the bar’s unique 6-digit serial number. On the rear of the bar is a diagonally recurring pattern of the refinery’s rectangular JM and crossed hammers logo.

In 2015, Johnson Matthey’s gold and silver refining operations in the US and Canada were acquired by the Japanese group Asahi Holdings, meaning that Johnson Matthey silver bars are no longer produced, which adds an extra cachet of collectability to Johnson Matthey silver bars.