2000-D MY Error????

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I was going thru a roll of 2000-D Maryland SHQ's and I found a coin where the date on the back was missing the "8". The outline is there but the number is completly gone? What would this be? An error. Bad striking? Just curious. Hope the pic works.

clackamas

A filled die, with grease probably.

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Thanks for helping me Identify this strike through error..............................