What this coin looks like (obverse, reverse, mint mark location, special features, etc.): The coin in the image above is an 1858 "small letters" variety.
There were two major varieties of the 1858 Flying Eagle Cent (Penny). One variety had small letters while the other had larger letters on the obverse of the coin regarding the words "UNITED STATES OF AMERICA". The best way to indentify the variety is to notice that the "small letters" variety has a large space between the first two letters "A" and "M" in the word America. The large letters variety has almost no space and the two letters are almost touching. This is depicted in the example image below of the 1858 small letters vs large letters flying eagle cent:
Coin value chart: Typical coin prices, values and worth in USD based on grade/condition