What grade do you think for this 1964 D? I was also wondering about the discoloration on the obverse (what causes it) and how it impacts the value of the coin?
@aro, that surface discoloration looks like tarnish to me, which is very common on silver coins. It is a little odd that parts of it seem to follow the design elements, e.g. around Kennedy's face and the words IN GOD. Hopefully someone can weigh in why that might happen and also provide you with a grade estimate.
"If you climb a good tree, you get a push." -----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed." -----King Adz
The toning shouldn't affect the grade, but it certainly can affect eye appeal, which may negatively impact the value of the coin. The grade is probably high AU or low MS, which means the value is mostly bullion value anyway.
It looks like there was something covering the obverse - like loose plastic of similar it protected the high points of the coin but the in the corners of the device elements.
i agree with the other comments. the tarnish is most likely from improper storage where there was higher humidity interacting with the metal. its not on the reverse because the coin was probably sitting face up
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