Thos is a beautiful 500g Baird & Co. Silver Bullion Bar. A substantial piece of investment-grade silver. ​Understanding This Silver Bar: ​Baird & Co. is a well-respected refinery based in London. The markings on the bar are standard for "cast" bars (which have that slightly rugged, poured look rather than a sharp, minted finish): ​500g: The weight is exactly half a kilogram (roughly 16.07 troy ounces). ​999.0 Silver: This indicates "Three Nines" purity, meaning it is 99.9% pure silver. ​X00760: This is the unique serial number, which is crucial for authenticity and matching with the certificate that comes along sealed at the back side of the bar.