@com, you are taking really good close-up pics, so good in fact that you might be chasing ghosts here. That round raised structure on the surface of the coin is most likely a small drop of dried glue with an even smaller air bubble in it. For the doubling, it is a little hard to get the necessary perspective from such a magnified pic, but I'm guessing it is Machine Doubling.
"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
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