What is the highest-denominated coin ever minted and how much does it weigh?

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Question: What is the highest-denominated coin ever minted and how much does it weigh?

Answer: The highest-denominated coin ever minted is the Canadian 1 million dollar gold coin, which weighs 100 kg.

What is the smallest banknote in circulation and its value in USD?

Who is responsible for investigating counterfeit currency cases in the United States?