In the 1960s Johnson Matthey formed a subsidiary, Johnson Matthey Bankers (JMB), which took its seat in the London Gold Fixing. 20th century īeginning in 1957, the company published a journal, Platinum Metals Review. Johnson Matthey similarly also produced the International Prototype Metre and its copies. In 1874, the company was commissioned to manufacture the kilogram reference standard, made from 90% platinum and 10% iridium, and held in the Bureau International des Poids et Mesures ( International Bureau of Weights and Measures), and copies of it for international distribution. The company had branches in the cities of Birmingham and Sheffield to supply the jewellery and silverware and cutlery trade with raw materials and ancillary supplies, such as silver solder and flux, which it manufactured. The following year the firm was appointed official assayer and refiner to the Bank of England. In 1851 George Matthey joined the business and its name was changed to Johnson & Matthey. Johnson Matthey traces its origins to 1817, when Percival Norton Johnson set up business as a gold assayer in London. It is listed on the London Stock Exchange and is a constituent of the FTSE 100 Index. Johnson Matthey is a British multinational speciality chemicals and sustainable technologies company headquartered in London, England.
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