I see nothing wrong with that helmet Richard. Both soldered on and one piece stamping Bandeau are correct for Wappens on issued helmets.
There must have been hundreds of those separate Bandeau ordered by each Regt prior to the awarding in 1899. You can’t hand an Infanterie Regt a new Wappen the next day. Bandeau would initially have to added to existing helmet eagles (like the one you posted), with later made ones being a one-piece stamping.
Füsilier-Regt. Feldmarshchall Prinz Albrecht von Preußen (1.Hannoversches) Nr.73 was a senior Regiment. Over the many years this Regiment existed, there cannot be only one method of Kammer mark. In the skull, on the rear visor, both are correct. Helmets moved from unit to unit, and were often repaired etc. Old helmets with old markings were cut down, modified, issued again. White or red painted Kammer markings in paint are common. Ink stamps or rear visors is the normal for newer helmets made up to 1914.
To the markings, I have several in white paint, a few in red paint, always an older helmet. Like this one.
Model 1860 Hannover Mannschaften (Other Ranks) Pickelhaube for Inf. - Regt. Von Voigts - Rhetz (3. Hannoversches) Nr.79, Hildesheim X. Armee-Korps. The helmet is unit marked with white paint IR79 1867 FB (Füsilier Batt) on the skull inside top.
Both FR73 and IR79 are are of course both X. Armee-Korps
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