The coin is a Morgan dollar the date 1891 is common and assuming it's circulated and has no mintmark, retail values are $17.00-$38.00 depending on the actual grade of the coin.
The US coin looks very much like a modern US penny
Look at the coin again. The first US one cent coin was struck in 1793.
It really depends on which coin it is. Is it a US silver dollar or dime? There is a big difference. Is it a world coin? What country is it from? All of these things matter when figuring the value of a coin.
About the width of a US penny (one cent coin)
Such a coin could not have existed, Lincoln pennies were first struck in 1909, in 1891 the US was using Indian Head pennies.
7-18-11>>> Assuming the coin is circulated and has no mintmark, the 1891 Morgan is a high mintage common date, retail values are $36.00-$45.00 depending on the grade of the coin.
6 Different US coins are dated 1801 so on your browser type in "1801 US coins" click images & search. You should be able to see what they look like.
The current US penny coin features the Union Shield Crest on the back side of the coin. A banner with the words one cent goes over the shield.
Please post a new question with more information. In 1891 there were 4 denominations of silver coins - dimes through dollars - minted at 4 different mints.
That depends on the denomination of coin.
No such US coin exists. You might have one from a different country, but you'd have to specify which country you were talking about.