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A plated coin is a normal coin with a thin plating of foreign metal applied to its surface.

It depends on the coin. If the coin is in another company's holder and the target company might want it in their own holder, then it might be worthwhile to send it in as is. If a company might think they would give the impression of being loose by crossing the coin, you might want to crack it out first. It really varies with the coin.

If you're talking about resubmitting to the same company, some companies offer the alternative of presidential review to reconsider the grade.