To Liberty's nose? This coin is a broad mill (not designated), NGC AU55 w CAC. So I assume the void in the poor thing's nose, being as sharp and clean as it is, must have been mint caused. What happens? foreign material stuck in the dye? Or am I completely wrong (wouldn't be the first time!)?
Nice die crack on the reverse too. Could it be a bag mark? Putting it into a sack with other coins might have done this possibility.
As soft as gold is - even alloyed - any one of a thousand innocuous postmint things could have created such a nice clean dent. You have to take that sensitivity into account when grading gold, because impacts which wouldn't make any mark at all on any other issue will be noticeable on gold. Yours has the interesting reverse bisecting die crack seen on some examples of this issue. It should go rim-to-rim unless yours is an earlier die state.