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None that I know of. The idea behind having a different metal in the core of any coin is to increase the coin's structural integrity. Gold is quite soft and though valuable, would make a poor choice for any coin. You may be thinking of a so-called bimetallic coin. Many countries issue these coins, but they're made of brass and copper-nickel, not gold and silver. Examples are the Canadian $2 coin, the European €1 and €2 coins, and the British £2 coin.
assuming you are referring to the $20 coin, it was called a Saint Gaudens
Gold coin used for European trade curency before Ist World War DUCAT
Frankingold
The Aureus.
frank
It's called a bezant!
The mintage coin data for Spanish 25 peseta gold coin is called the beard bust and is 90% gold. You can go www.coindatabase.com/coin_spain.php?pais=620 to check my answer.
During most of the Roman Republic gold coins were called Aureus and silver were Denarius
Deutschmark (the former currency of Germany) Drachma (formerly used in Greece) Ducat (a gold coin used prior to WWI)
A gold bar, also called gold bullion or a gold ingot, is a quantity of refined metallic gold of any shape that is made by a bar producer meeting standard conditions of manufacture, labeling, and record keeping. A gold coin is a coin that is made mostly or entirely of gold. Traditionally, gold coins have been circulation coins, including coin-like bracteates and dinars.
Florence became an important banking city at this time in a large part due to the strength of its gold currency. It was called a florin and was the first European gold coin that was created in large quantities.