Headquartered in London, Johnson Matthey is a multinational corporation that produces chemicals and precious metals. These gold bullion bars are made by Johnson Matthey, a refiner that has been in business since 1817. Renowned the world over for the quality of their products and the reputation that has endured for nearly 200 years, Johnson Matthey is a favourite among bullion dealers and stackers alike. These Johnson Matthey Bars are 9999+ Fine Gold and weigh 1 troy ounce. Each bar has a unique serial number.