Good questions Khukri, thank you. I'll be happy to answer them.

---Concerning the attachment of the liner, all my schell from KR or JzPf have rivets with 2 folding tabs 1 to 1.5cm back behind the circle in strong leather, or large felt. (This applies to my M60, 62, 67, 89, 89/94 and even 1915).
The only exception is my Lachmann M15 from GKR.
For your information, here's a photo of 2 post-sides, for schell de Kurassier M94. They're massive, with a riveted pin behind the hull; then the rivet is soldered on with tin.
View attachment 40260
So the side posts only exist to attach the half-jugulars to each side. The liner is fixed by 2 rivets (square or rectangular heads most often, but sometimes round as on mine), located behind the 2 side posts. There's also an identical rivet at the front, behind the front plate, just above the visor, and a rear rivet, the head of which is under the first edge of the lobster tail.
Below, the welded post-side, and the rectangle drilled for the liner clip. (archive photo).
View attachment 40261
View attachment 40257
So only my Lachmann has one side-post per side. No rivet, behind the side-post in this case :
View attachment 40285
---With regard to the manufacturer's markings, mine are also marked on the hemmed edge of the visor. But there's nothing special about this manufacturer, as Clemen used to do the same on leather infantry helmets.
Note on the manufacturer's mark on the KR and JzPf schell: M60 to M89 were not marked, as far as I've been able to see. The M89/94 may be. Only the M15 schells are marked and dated, at the bottom of the hull (Juncker, Nachzigall, Israël etc...).
---The M1902 eagle is mounted in the 2 original holes of the old Linien-Kurassier eagle.
View attachment 40263
---The M1902 eagle is mounted in the 2 original holes of the old Linien-Kurassier eagle.
View attachment 40265
Note not included :
My helmet has two remarkable originalities:
---The brass edge U is nickel-plated, as are the lobster tail rivets.
---The liner is not a rounded wolf's tooth,
but square.
Translated with DeepL.com (free version)