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
Gold dollar coin. In January 1849, McKay introduced a bill for a gold dollar, which was referred to his committee. There was much discussion in the press about the proposed coin; one newspaper published a proposal for an annular gold dollar; that is, with a hole in the middle to increase its small diameter. McKay amended his legislation to provide for a double eagle ($20 gold coin) and wrote to Patterson, who replied stating that the annular gold dollar would not work, and neither would another proposal to have dollar piece consisting of a gold plug in a silver coin. Nevertheless, Gobrecht's