What's a Lincoln look like on the inside?

Just received a Lincoln Cent in change today. Looks like a steel cent and is much lighter in weight. Date is a 1990. Only thing I can conclude is that the copper coating has been melted off. Detail is quite full though.....is this possible?
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The Whisker Cheek Collection - Top 50 Peace VAM Registry
Landmark Buffalo Collection
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The 'Zincolns' look like this from the inside
Lincoln set Colorless Set
lol
AL