split after strike delamination?

This is an odd one. A piece clearly broke off, leaving a latent print of the original lettering.
I outta know this, but what am I trying to call it?
This wasn't a clamshell, as you see the edge is even. It broke from the rim.

 

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I don't know much about errors but I see the letters faded. Maybe a defective planchet? Someone else will chime in.

 

It's a lamination that detached after the coin was struck.

 

That makes sense, thanks.