@Write2bfree It looks like post-mint damage (PMD). A crack on a die would leave a raised mark on the coin. That is because the metal would flow into the void created by the crack on the die. Chris
It looks like a crack to me because it appears raised. Here is one of my favorite lamination errors. Chris "Crackhead"
Die cracks are found on the die itself. The metal from a blank Planchet flows into the crack when the blank is struck so it would look raised as the examples provided in the other posts. A cracked planchet is on the planchet itself. Totally different issue.