Die Deterioration at the bottom of the bust along with the crack, because of very poor die maintenance (polishing does have some "up" sides).
1925 & 1926 are notorious for this deterioration at the bottom of the bust.
I remember one online thread where the OP wondered if the extreme ones were the result of a clash. The answer was nope.
Words of encouragement are one of the major food groups.
We need to consume them regularly to thrive and grow.