Found this in my Mint bag of Jeffersons

Going through my Philly mint bag looking for "decent" examples of the new nickel. As has been said on here before, the surfaces are LOUSY!! 
I found this nickel that was "toned" Any explanations on this one? Also, has anyone noticed that a great many of the nickels seem to be incompletely struck?

I found this nickel that was "toned" Any explanations on this one? Also, has anyone noticed that a great many of the nickels seem to be incompletely struck?
"I won't be wronged, I won't be insulted, I won't be laid a hand on; I don't do these things to other people, I require the same from them."
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The Ludlow Brilliant Collection (1938-64)
darker colored '04 jeffersons