Oversize Lincoln Cent

[quaidmon]

Found this in my pocket change. At first I thought it was a nickel because it looks silver. The edge looks like a clad coin(silver and copper. It is 1/16 of an inch bigger than a normal cent but doesn't look like it was damaged in any way. Any ideas?

 

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[l.cutler]

It has probably been heated, this causes the zinc to come close to melting and spread out.