Bi-metallic coin dated 2006 (minted at Noida). Since 1996, Canada has also produced bi-metallic $2 coins (nicknamed "toonies"). Great Britain has issued a bi-metallic 2-pound coin since 1997; and Singapore has issued a bi-metallic 1-dollar coin since 2013. The first ever tri-metallic circulating coins were 20-francs coins introduced in France and Monaco in 1992. These were similar to the corresponding bi-metallic 10-francs coins, but had two rings instead of one. As well as circulating coins, where they are generally restricted to high-denomination coins, bi-metallic coins are often used in commemorative issues, often made of precious metals. For example, the only bi-metallic coin
Dollar (Hong Kong coin) Dollar (Hong Kong coin) The one-dollar coin is the fourth-highest and fourth-lowest denomination coin of the Hong Kong dollar. It was first issued in 1866 as a silver coin of a diameter of 38 mm, a mass of 26.96 grams and a thickness of 2.80 mm. This issue lasted only three years with a reported mintage of 2,109,000 coins in total; separate statistics of each year's mintage are unavailable. The second introduction of a dollar coin was started in 1960 as a copper-nickel coin of 30 mm in diameter, 2.25 mm thick, and weighing 11.66 g. The circulation of this