I have found several of these large chips 83 LMC but inside the of the 8. The condition I've found them on is about BU. I hang on to them because they are interesting and in nice grade.
It's definitely a die break in the date. The shape, size, and the way it mingles with the devices are the give away clues. It's not a bubble or split plating.
Coop - those huge rot blossoms usually only happen around the mintmark and are a result of split plating. I don't see a split on this 1983 cent.
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