1966 Quarter. Error, Fake or damage?

I was hoping for some feedback on this coin I found in my change. It is a 1966 Quarter weighing just short of 5.7 grams. I've attached some pics for your consideration. Thanks in advance for the help.

 

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It appears to just be damage.

 

Thanks for the quick reply. I found a similar thread from several years back on these forums. http://www.cointalk.com/t39675/ but the difference is that mine is clad.

 

I agree with Matt... quarters seem to be highly suseptible to damage. Check out this beauty I received in change:

 

Obviously minted from warped dies.



<doh!>

 

Damaged.

Copper-Nickel Clad Quarters are supposed to weight 5.67 +- grams which is just short of 5.7 grams.