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The Penny is used the most in the US.
If you mean the coin with the lowest denomination, since 1857 it's been the 1¢ coin, commonly called a penny.Prior to that year the US also made half-cents which are the lowest-value common circulation coin ever minted in the US.
The coin is not a rare variety. It's worth at least $0.01.
If it is a US ten dollar coin, it is worth at least 800 dollars, and maybe more, depending on the condition and the mint information.
The US has never made a one cent silver coin. It's likely been plated as a novelty coin or to be used as jewelry. It has no collectible value.