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 Hungarian pengő coins. Later the cupronickel 10, 20 and 50 fillér coins were recalled as well, moreover, even the bronze 1 and 2 fillér coins disappeared after a time. First, they were replaced by steel, later - in the case of the 2 fillér - with zinc coins. The war coins were redesigned by Lajos Berán. As the war escalated, none of the above metals was cheap enough to mint coins. The solution was the issuing of low denomination paper money (see there). Only an aluminium 5-pengő-coin was minted under the postwar government. Due to the rampant inflation, all coins were withdrawn