kushans
Not Kushanas, It was Gupta's, who introduced Gold Coins in India..
Indo-Greeks
Brass not gold. Just the Mint issue uncirculated coins have very small premiums above face value.
The 2006 American Buffalo $50 gold coin was the first US coin to be struck in 24k gold. Other mint issue gold coins, $10, $20 etc are aproximately 21k, containing 90% gold.
There was not anyone who wanted Roman gold coins the most. Generally, the poor could not afford to have gold coins. Roman coins, both gold and silver ones, reached Arabia, Persia, India, China and Ethiopia through the trade the Romans had with these parts of the world.
The Royal Mint does not issue 9 carat gold coins.
The U.S. Mint did not issue any gold Susan B. Anthony dollar coins.
first to use gold and silver coins
The Ancient Chinese created the first coin money with some of it in gold.
The U.S. does not issue "Tallar" coins.
Yes, but they are only the very first series of gold coins made by the United States.
the Romans were the first people to make gold coins as they were the first to use currency as well