I have seen plenty of thin planchets, but they are all missing details significantly. This one has a strong obverse strike, and a decent reverse strike. It also is a bit smaller in diameter and weighs only .7 grams. I am positive it is altered, but how are the details so strong for it being so thin? I checked the edge and it definitely is not 2 shaved coins stuck to each other, and it is copper. Anyone have any idea about this?
Chemical reaction. PMD. I have many over the years that can be twins. Most of them are 60's. High schools did chemistry experiments using the cent.
.7 grams seems odd. Rim/edge photos? So Schwa says this has been eaten away by acid. I would accept that. Why does it attack the edges first? Or it just appears to and attacks the whole coin all over.
Joe, although I see the difference you mention, I've seen plenty like this one...maybe a different type of acid or ? Looks fairly typical to me.
I would go with the acid also, but I think something was done to reduce the raised portion of the rim first so it would disappear almost entirely ( evidenced by the obverse). This would remove a large chunk of weight and the acid would not have to react as deep and more detail would remain as a head scratcher . Be interesting if the diameter was similar to the inside diameter of the rim of a regular cent. Jim
