1927 wheat back penny (2.55g?)

Been wondering about the damage to this. With the black coloring in the pits, even along the edges, what can cause it? A friend who collects coins saw it and weighed it, and you see the picture, 2.55g, when it should be 3g at least, right?
Opinions plz?

 

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looks like environmental damage, probably an acidic environment which ate away at it causing the pits an low weight..

 

I agree. Only something acidic would cause a grainy appearance like on your coin.

 

Environmental Damage. Corrosion to the surface. Not a Mint Error.