Most impressive piece to me is the 38 S Jefferson. The 18 D buffalo looks like a vinegar soak restored date.
Went thru some of the proof nickels and came across these two. First looks like it has a die crack across the bottom of the obverse and another near the face/neck. The rotation on it is also slightly off. I was debating the bottom crack being a scratch but the more I looked at it I felt otherwise. The second pictures has a nice die crack on the reverse inside the Monticello from the stairs to the window. I felt these were pretty cool finds considering they are also on proofs.