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 coin (United States) than $4 million. There are 8 Class I dollars, struck in 1834 for the aforementioned sets, 1 Class II dollar, struck over an 1857 Swiss Shooting Thaler (and now residing in the U.S. Coin Collection at the Smithsonian Institution), and 6 Class III dollars, struck surreptitiously sometime between 1858 and 1860 to meet collector demand for the coin. Seated Liberty dollars were introduced in 1836 and were minted in lesser quantities than the sparsely minted Gobrecht dollar that preceded it. The dollars were used in general circulation until 1873. The production of large numbers of U.S. gold coins (First $1