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The coinage metals comprise those metallic chemical elements and alloys which have been used to mint coins. Historically, most coinage metals are from the three nonradioactive members of group 11 of the periodic table: copper, silver and gold. Copper is usually augmented with tin or other metals to form bronze.
Group 11 is also known as the coinage metals, due to their usage in minting coins [2] —while the rise in metal prices mean that silver and gold are no longer used for circulating currency, remaining in use for bullion, copper remains a common metal in coins to date, either in the form of copper clad coinage or as part of the cupronickel alloy.
For new coinage, the old style of a large number was replaced instead with the national Garuda Pancasila logo, with the year and "BANK INDONESIA" in smaller text below the emblem. A 25 rupiah coin dated 1991 in aluminium, with images of nutmeg and its Indonesian text 'buah pala' and "Rp 25" on the reverse, was the smallest coin to be revised.
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Striking a coin refers to pressing an image into the blank metal disc, or planchet, and is a term descended from the days when the dies were struck with hammers to deform the metal into the image of the dies. Modern dies made out of hardened steel are capable of producing many hundreds of thousands of coins before they are retired and defaced.
Alongside the two circulating variants, the Bank of Indonesia also minted a non-circulating silver coin of this value in 1970. [6] It weighs 8 g (0.28 oz) and has a diameter of 26 mm (1.0 in). Its obverse features the national emblem Garuda Pancasila, the lettering "1945-1970," "1970," and "200 RUPIAH," and the Bank's logo.
The Indonesian one thousand rupiah coin (Rp1,000) is a coin of the Indonesian rupiah.It circulates alongside the 1,000-rupiah banknote. First introduced on 8 March 1993 as bimetallic coins, they are now minted as unimetallic coins, with the first of its kind appearing in 2010 and its latest revision being in 2016.
The coinage of India, dating back about 2500 years, provides material evidence of the abundance or scarcity of various metals, the names and sometimes dates and mint locations of ruling authorities, of written languages in use, of religious affiliation, the state of metallurgy, systems of weight, currency systems and cultural values. [65]