This is Coop's overlay. Doesn't seem to match up to me, it's probably a plating bubble - try pushing it with a toothpick to see if it flattens or moves:
MS70Error5: -Look at clash overlays (in rarer cases the clash could be rotated or offset) -Check http://www.maddieclashes.com/ -If it's made in the year 1982+ (copper plated zinc often has plating bubble issues) try flattening it with a toothpick
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