Heraeus Precious Metals GmbH & Co. KG, a wholly owned subsidiary of Heraeus Holding GmbH, is the world’s largest privately-owned precious metals refiner and fabricator. Its international headquarters is in Hanau, about 25 km east of Frankfurt. Gold refining and the manufacture of Heraeus bars are undertaken at 4 locations:
Germany (Hanau) Heraeus Precious Metals GmbH & Co. KG
China (Hong Kong) Heraeus Limited Hong Kong
USA (Newark) Heraeus Precious Metals North America LLC
Switzerland Argor-Heraeus SA (associated company)
and the Heraeus refinery has been based in Hanau, near Frankfurt, for over 160 years. The company also manufactures London Good Delivery silver bars (since 1972) and London Good Delivery platinum and palladium bars.Ownership Heraeus Holding GmbH , the Heraeus refinery has been based in Hanau, near Frankfurt, for over 160 years. Accreditated of
1958 London Bullion Market Association (LBMA)
1974 CME Group - Market Contract: COMEX
1982 Tokyo Commodity Exchange (TOCOM) 
The front of the silver cast bar is stamped with the refiner’s name ‘Heraeus’ and the silver bar’s purity, ‘Feinsilber 999” or 'Feinsilber 9999' imprinted above, and the weight  inscribed below. Note that all Heraeus silver bullion bars manufactured since 2014 have a silver purity or fineness of .9999.