What type of error is this coin?

[DeepseekerADS]

A friend asked me to post some pictures here to find out if this is a mint error, or damage. I've never seen anything like this. If I recall correctly this is a 1997 Rosie....

Sorry for the pictures - they could be a lot better....





As you can see from the pictures (I hope) the rims are knobby, and edges more deeply.

Thanks for any help you might wish to offer.

 

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[enamel7]

Appears to possibly have been encased. Can't tell for sure. I would say pmd regardless.
HH
enamel7

 

[Mackaydon]

Retaking in focus pics out of the 2X2 might help in the ID.
Don..