First pic of the reverse look like a gouge, but with the last pic, I see what you're talkin' about - don't remember seeing PMD like that before...
Because its damage and not all coins are alike.An optical illusion,the 2nd picture clearly shows the spot is incused therefore its damage.
I placed the coin in a different angle under the microscope and noticed slight scratches at a different angle definitely shows it to be incused at higher magnification Definitely a illusion learn something new every day thanks
Looking at the rim in that area on the last picture, I think it took a hit which moved a small portion of the rim away from the edge! JMO