Hey Tony, glad you liked it... I actually bought this from your friend Peter Whamond back last summer. He also had a superb Infantry EM M1910 crusher-style Schirmmütze that someone snatched before me.
As I recently took better pictures of my hat, I increased the contrast on a closeup of the owner’s label inside the liner (last photo) to see if someone could make out if it belonged to Artillerie, Pioniere, Verkehrstruppen or… some Flieger soldier =P~ ?