This cent looks like a number of errors are on it. The dark color looks like a mishap with the die. A line on the face looks odd. By the way it weighs 3.0 g. Let me know your thoughts.
Looks like a die crack with a slightly small planchet. A die crack usually doesn't raise the value of a coin, but it depends on who buys it.
If the line is raised then probably a die crack, the coloring is typical however. weight is also normal. anywhere from 2.9 grams to 3.2 grams would be within the realm of typical possibility IIRC.
It looks to me like the residue left from a piece of scotch tape across the Obv. You can see both edges of the tape on the Obv.
