Although I fall into the camp of skeptics regarding the integrity of Corky's helmet, I would like to direct everyone's attention to the following:
Reiner Herrmann, Militärische Kopfbedeckungen der Kaiserzeit, page 149 (Fußartillerie Filzhelm) and page 159 (Sächsischen Grenadier-Regiments Nr. 100).
Eric Johansson, Pickelhauben, pages 57, 58, and 60.
Jean-Louis Larcade, Casques A Pointe: Tome II, page 156.
I think the concept of an Offizier filzhelm can be accepted as fact. However, Corky's helmet is a crazy mix. I'd be willing to bet the chinscales are zinc (magnet time), but what are they, and those Kokarden, doing mated to a Mannschaften Garde Adler and that spike?
After seeing the illustration in Herrmann, I believe the spike to be good.
It's an odd piece.
Chas.