High point wear shows pretty well on pictures as does even, but light rim wear. It doesn't take much to move a coin down to AU.
The pitting attributed by the earlier poster is invisible to me. Looks like standard toning. I wouldn't dip the coin though. The contrast of toning on these fishscales enhances their naturally crappy/weak strike and makes them look better than they technically are.
Having said that, there's a lot of glare on the high points in your photos, not easy to grade from them but the way the photo represents the coin it looks like it's been pushed across a couple counters to me.
AU 50 and that flatness at 3:00 on the obverse rim does it no favours at all if it looks like that in hand.
Try photos with indirect natural lighting and a motionless camera on time delay for fishscales. I post a few here and there in this forum, should give some examples.
Cheers and good luck with your grading.