Take it to a coin shop. They will tell you if it is real or not.
A two cent US coin is larger in size than a ten cent US coin.
They never have. If your coin has a hole and is a US coin then someone drilled it in. It was not done at a US mint.
Sacagawea is on the US $1 coin.
Assuming the coin is circulated and has no mintmark, the Philadelphia issue 1863 Liberty Head double eagle is a low mintage coin that is scarce in all grades. For an accurate assessment of value the coin needs to be seen, authenticed and graded. In general retail values for low grade coins are $1,690.00-$1,720.00, better grade are $1,740.00-$1,750.00 and coins showing almost no wear run from $1,760.00-$1,830.00. Values are a market average and only for coins in collectible condition, coins that are bent, corroded, scratched or have been cleaned have far less value if any to a collector or dealer
The first US dollar coin was made in 1794.
You are probably thinking of an "error coin". This coin is any coin which does not meet the standards of the US Mint or has a flaw in its design or manufacture.
...Of what US coin? There have been several US coins intended for circulation ranging from half a cent to $20.
Harriet Tubman has never been on a US Mint Coin.
Please be more specific which coin?
The US 50 cent coin has JF Kennedy on it.
The penny coin which was worth a cent
The US 10 cent coin has president Roosevelt.