Error coin post 2: Struck through grease

Here is a New Jersey quarter, still in the mint package, that I got from the mint in 99. Anyway, what I would like to know is what severity of error is this? Does the coin have any additional value in that it is part of a mint set?
Also, I am assuming that it was struck through grease, is this correct?
Also, I am assuming that it was struck through grease, is this correct?
Awarded latest "YOU SUCK!": June 11, 2014
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~*Bugs*~
That's a filled die error. The die might have been partially filled with grease to cause that, but the term "struck through grease" is used to describe a coin where the entire surface is vague and rough because the grease was between the coin blank and the dies.
Quite an impressive filled die, nice coin!
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J. Taylor
CONECA Member
FSNC Member
I've seen less dramatic state quarter filled dies go for more than that.