99% of the time that a coin like this appears to be under graded is there is a rim/edge problem or the coin is hairlined. I believe that is the case here. The surface does not appear to be original. Take two more images of the reverse with the slab tipped at an angle eagle up and tipped w/eagle pointing right.
Yep! Look at the top (new) image. Note how the color in the area under "In God" and at the top of the wing is different. There is an outline around the relief. Look at the color in the field under "United." IMO, the coin is not original.