The first copper-plated zincolns were a pure copper plate over a pure zinc core. The zinc core oxidized too fast resulting in bubbles (See Link to Original thread ). The mint addressed the problem by adding a small amount of copper to the zinc core in 1984.
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Comments
<< <i>bubbles under the copper plating >>
Ditto!
Totally common on the Zincoln Cents!
The name is LEE!
For being so common, it's the first time I've seen one.
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