Metallurgical assay and the U.S. Mint continue to produce precious metal bullion coins for collectors and investors. The precious metal purity and content of these coins is guaranteed by the respective mint or government, and, therefore, the assay of the raw materials and finished coins is an important quality control. In the UK, the Trial of the Pyx is a ceremonial procedure for ensuring that newly minted coins conform to required standards. Metallurgical assay A metallurgical assay is a compositional analysis of an ore, metal, or alloy. Some assay methods are suitable for raw materials; others are more appropriate for finished goods.
Coins of the Austro-Hungarian krone Coins of the Austro-Hungarian krone Austro-Hungarian krone coins were minted with different design (but the same technical parameters) in Austria and Hungary. The Austrian coins were minted in Vienna. Denominated coins for Austria: 1, 2, 10 and 20 Heller; 1, 2, 5, 10, 20 and 100 Corona (the Latin form of the name was used on coins). The Austrian 100 corona is still being minted, with a 1915 mint mark to enable Austrians to take advantage of a grandfather clause in the law regarding private ownership of gold bullion. It is a popular gold bullion coin similar to the Krugerrand.