I think it is what is called a capped die. Or, an extreme case of clogged die otherwise known as struck through grease/debris. Both of these are in the error category, not PMD.
Presuming this specimen has a normal weight, the reverse was struck through a split planchet or a planchet derived from rolled-thin cent stock.
I was looking at the details of the reverse and was wondering at what point it may have been struck (early, middle, late die cap). I hadn’t considered a split planchet or thin planchet. What indicators had you leaning this way? Or through your experience/mint connections it was determined that these are the most likely suspects? Thanks.
To answer Kevin Mader, only the raised ghost of the Memorial is present. The incuse ghost of Lincoln is absent. This indicates that the disc that lay underneath the planchet represented by your coin was abnormally thin.
