The term "Struck Through" suggests that you know what caused the anomaly. So, why don't you just say that it is the result of a grease-filled die? Otherwise, if you do not know the cause, it should be referred to as a "Strikethrough" which (tacitly) implies that the cause is unknown. Chris
In my opinion, grease-filled dies are more common on Lincoln cents than any other type coin. Several years ago, I searched a $50 Mint bag of 1980-P Lincoln cents, and I found dozens of different grease-filled dies. Chris