What Happened To This Penny?

[deershed]

What's up with this penny?
It looks like part of a wheat back stamped on back of a Lincoln.Any thoughts?

 

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[GlenDronach]

A lot of pressure or some sort of solid substance like an epoxy. PMD for sure.

 

[ramjet2187]

Looks like adhesive residue. Someone might have glued a wheat cent to the reverse of this coin, producing a "two headed" cent.

Or, maybe not.

 

[jrf30]

pmd