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.