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 rupiah fourth and final Indonesian FAO coin. The 1974 5 rupiah, meanwhile, was updated '1979', issued from March 1980, retaining its family planning message, but adding a circular decoration to both reverse and obverse of the coin, and being shrunk in size from 3.0 to 1.4 grams, presumably to cut the cost of production. 413 million coins were minted dated 1978, while 5 million were later issued dated 1995 and 1996. The 1974 10 rupiah was similarly updated with decoration to '1979', enlarged with the composition changed to aluminium. 286 million were minted with this date. No 10 rupiah coins have