Here is a 1987-P
Lincoln Memorial cent that was pulled from circulation soon after release and has been stored in a 2x2 for about 33 years. Pix will probably not help resolve the question, but note the partially filled "9" in the date. Under close inspection, it appears to be a linear bit of metal; however, the "9" is not completely filled. Since the coin was plucked immediately from circulation after the anomaly was noticed, I don't think it's a problem with zinc rot or related issues (the 9's filling looks like solid metal, not porous or bubbled). Any thoughts? Note: coin was not removed from 2x2 for photos; thus, there may be some reflection from the plastic covering.
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