Lincoln Double Die? or Machine Doubling?

My 2nd day roll searching for errors, so mind my lack of knowledge in the field. This is a 1977-P Lincoln

 

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it looks like MD to me

 

Mechanical or strike doubling

Mechanical or strike doubling - see they way the images seem to be scooted, pushed or pulled? This is a perfect example of die chatter or bounce, ejection doubling all the same thing, not a doublED die.
Keep searching!

 

Thanks, so much to learn, so much to learn..

 

........the flatness indicates machine/shelf doubling. here is some info on the subject.

http://www.geocities.com/NCADD/educational1.html

 

I've never even found a MD before, so nice little find.