Different denominations of U.S. coins dated 1891 exist. The easy way to see one is type 1891 US Coins into the search box on your browser and click on images.
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.
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.
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.
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.
That depends on the denomination of coin.