I have a 1989 penny and idk if it is MD but I know you guys will know and also where the black arrows are it is dipped in what is that and the bottom of the T in TRUST is missing grease filled?
Called plate doubling, I say "ghosting". Caused by machine vibration, a sympathetic effect on the plating. The ridge you see forming is die wear/flow. Pressure cause metals to move outward, stacking up in a extra ring like that.
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