Posted 12/17/2016 8:08 pm
That is not a die crack. That is part of a broken post that forms the center of the mint mark that has broken off the die.
When this post is all the way broken off the die, the center will be totally filled in. The more it crumbles off the die where the post was connected, then the higher the mint mark will become. This will show on insides of letters and date enclosures also.
