The Dime in the proof set I received from the Mint looked like it had toning on the reverse, which seemed a little odd for a new proof set. When I looked at it closely, the reeding looked like copper. It was as though there wasn't enough cladding on the planchet. Look at the lower rim on the reverse image. Also, both photos were taken about the same time. Annealing process maybe?
@parn, I do see that some of the reeds seem to be copper colored and I also see what looks like diffuse toning across the bottom on the rev. I'm interested to see what others think, because neither of these seems to out-of-the-ordinary to me.
"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
I believe it is just toning. The lens is not air tight, so the coins are subject to the environment from the Mint, to the fulfillment center, to you. It does not take much to get a coin to start toning.
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