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  2. Vienna Philharmonic (coin) - Wikipedia

    en.wikipedia.org/wiki/Vienna_Philharmonic_(coin)

    For the 25th anniversary of the Vienna Philharmonic gold coin, the mint introduced the 1 ⁄ 25-ounce coin featuring the same design, but with a face value of 4 euros. Also for the anniversary, 5,000 proof sets of the one-ounce and one-quarter ounce coins were produced. [9] The 1 ⁄ 25-ounce coin has been continued in production.

  3. Coins of the Austro-Hungarian krone - Wikipedia

    en.wikipedia.org/wiki/Coins_of_the_Austro...

    The Austrian coins were minted in Vienna, and came in face values of 1, 2, 10, and 20 heller; and 1, 2, 5, 10, 20, and 100 kronen.The Austrian 100-krone coin 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.

  4. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    Seven distinct types of coin composition have been used over the past 200 years: three base coin alloys, two silver alloys, gold, and in recent years, platinum and palladium. The base metal coins were generally alloys of copper (for 2 cent coins and lower), and copper/nickel (for 3 and 5 cent coins). Copper/nickel composition is also used for ...

  5. Executive Order 6102 - Wikipedia

    en.wikipedia.org/wiki/Executive_Order_6102

    Executive Order 6102 required all persons to deliver on or before May 1, 1933, all but a small amount of gold coin, gold bullion, and gold certificates owned by them to the Federal Reserve in exchange for $20.67 (equivalent to $487 in 2023) [6] per troy ounce.

  6. Coins of the Romanian leu - Wikipedia

    en.wikipedia.org/wiki/Coins_of_the_Romanian_leu

    In 1900, cupro-nickel 5, 10 and 20 bani coins were introduced, with holed versions following in 1905. The production of coins ceased in 1914, recommencing in 1921 with aluminium 25 and 50 bani pieces. Cupro-nickel 1 and 2 lei coins were introduced in 1924, followed by nickel brass 5, 10 and 20 lei in 1930. In 1932, silver 100 lei coins were issued.

  7. Gold standard - Wikipedia

    en.wikipedia.org/wiki/Gold_standard

    France's actions in maintaining the French franc at either 4.5 g fine silver or 0.29032 g fine gold stabilized world gold–silver price ratios close to the French ratio of 15.5 in the first three quarters of the 19th century by offering to mint the cheaper metal in unlimited quantities – gold 20-franc coins whenever the ratio is below 15.5 ...

  8. Dollar coin (United States) - Wikipedia

    en.wikipedia.org/wiki/Dollar_coin_(United_States)

    The gold dollar weighing 1.672 g produced from 1849 to 1889 in 90% gold 10% copper. 1849 to 1853 gold dollar coins were 13 mm across and are called Type I. Type II gold dollars were thinner but larger at 15 mm diameter and were produced from 1854 to 1855. The most common gold dollar is the Type III, struck from 1856 until 1889.

  9. Gas blending for scuba diving - Wikipedia

    en.wikipedia.org/wiki/Gas_blending_for_scuba_diving

    "Tx 20/40" (or Tx 20/40/40) would be a trimix blend with 20% oxygen, 40% helium and the remaining 40% nitrogen. This would be suitable for depths up to 60 metres (200 ft) if the partial pressure of oxygen is to be limited to 1.4 bar. This is a normoxic blend and is safe to use at the surface.

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