It strikes me an an original Busby frame, but it likely had hair shed or damage to the outside. A prior owner looks to have replaced it with black wool? Passing for a theatric production, but not for collecting.
Here is a neat one I got in yesterday that I thought you all may enjoy. I only have one other photo showing the M1905/06 Versuchshelm, but from a distance, so I was happy to add this to the collection!
The photo is now on its way to the collection of Steve McFarland! I know it will be very comfortable among his impressive assembly of battle flags and related items.
Any of these old pattern Pickelhaubes, regardless of country, are worthy of collecting and preservation. Beautiful! My wife, who is part Swedish, would love it.