@esf, at least from these pics, I'm only seeing normal circulation wear plus some plating pimples. If you can depress them with a wooden toothpick then they are bubbles but if not then there may be a little bit of debris trapped between the copper plate and the zinc core.
"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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