I will say that @vest is right on with that answer. Rim dings aside, that bubbling in the middle seems to happen when clad coins are heated (such as in a campfire).
"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
-----Ghanaian proverb
"The danger we all now face is distinguishing between what is authentic and what is performed."
-----King Adz























