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
Hong Kong two-dollar coin Hong Kong two-dollar coin The two dollar coin is the third-highest denomination coin of the Hong Kong dollar. Since its introduction in 1976, it is one of two circulating coins to not be round (the twenty cent coin is also not round). The two dollar coin is a dodecagonal scallop in shape, and made of cupro-nickel. It was issued in 1975, and thus became the highest denomination coin until the five dollar coin was introduced the next year. The coin was a new denomination to the Hong Kong monetary system, as suggested by the Coinage Review Committee. The obverse featured