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) The coin featured a plain edge through 2008, but starting in 2009, incused lettering was applied. The year and mint mark moved from the coin's obverse (front) to its edge. As of 2019, dollar coins are not widely encountered in U.S. commerce, except in vending machines for rides on mass transit, some pay and display machines, some laundromats, and old-fashioned slot machines. On the other hand, the Sacagawea dollar has achieved popularity in El Salvador, Ecuador and Panama, where the U.S. dollar is also the official currency. With the passage of the Native American $1 Coin Act on September 20,