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Swiss coins, Swiss National Bank
http://www.snb.ch/en/iabout/cash/id/cash_coins#t2
Since 1982, all coins have been minted with medallic orientation (↑↑), i.e. the top of the reverse shares the same position as the top of the obverse (↑↑, also called British turnover or German mintage). Until 1981, however, the ½-franc to 5-franc coins were minted with coin orientation, i.e. the image on one side of the coin is upside-down relative to the other: (↑↓, also called French or US mintage), whereas the 1-centime to 20-centime coins already had medallic orientation. The orientation was changed in order for the coins to be presented better in coin sets (annual sets).
Source: Swiss National Bank