One side may have been exposed to a corrosive environmental agent, while the other side--perhaps in something like a Whitman album folder--was shielded from exposure. I've seen similar coins across a variety of denominations while coin searching the last several decades. Not that common, but does happen.
Quote: What would keep a coin shining on one side but dull on the other?
I agree with the above, but alternatively, this coin might have spent some time in a fountain, with one side constantly exposed to sunlight and the weather elements.
"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
Quote: If the coin was in a roll the inside side will not be affected.
If it were in a roll, then the edges would also not be affected. This coin spend a long just witting somewhere reverse side down and the obverse got the brunt of the environment it was in at the time.
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