Question about a Star wars #1 2 2

[patman2011]

I picked this book up and was wondering if anyone else had run into this error.  If you look at the top of the book it almost looks like it has been spray painted but when you run your finger over it there is no difference in feel to the normal gloss of the book so it must have come from the factory this way.  Is this a common error with this book because I have never seen one like this before.  Any info would be appreciated.  

[grendelbo]