Interesting Underinking on Corner

Never seen something quite like this before, where a whole bit of the corner is missing due to underinking.

 

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It is strange but not enough to increase the value. Not enough interest.
Has to be dramatic.

 

I have both under and over inked notes. They can appear anywhere on the note. It must be a lot more than your note to gain interest and raise the value.

 

Looks more like the blanket was smashed and left a low spot that didn't print on the next bills.
It Ink color looks consistent, so under inking NA