Not a clipped planchet. My guess is PMD due to the exposed core but lack of displaced metal and how uniform it is makes me second guess. Others will hopefully chime in, a shot of the rim of the area in question might show something I'm not seeing but I'm going with PMD.
Note on the last two images. Note the edge took a hit and it exploded the rim area. Cause and affect on the coin. With the zinc exposed, they rot begins, which the images show that well. Great presentation.
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