My observances:
-The trim appears to be plated brass so who knows if the spike and studs were scrubbed or replaced.
-The wappen looks like it was replaced, it doesn't sit flush and the holes were expanded.
-Where are the inside of the studs or rivets on the neck?They aren't fake like on the ersatz helmet so how uncommon is that?
-The large kokarden look like replicas, not just repaint, especially where the inner part transitions to the ring
-The M91 posts look like those found on late war models, and as stated previously the chinscales are incorrect. See pic from my 1915 dated JzP.
-also I don't see any markings, not even a size on the trim unless they're hard to see.
-aesthetically speaking, the rust inhibiting/encapsulating paint is painted over the stud washers, and the liner still has mildew.
It's an ok display but probably a frankenhelm