Liner is original, and the liner is damaged. It's a typical J. Bambus & Company helmet shell and corresponding liner like I would expect to see in a J. Bambus & Company shell. Liner is an original typical light brown color, 9-finger or "tongues" as we see in the J. Bambus & Company felt ersatz helmets normally. Sometimes they also used a black color liner in the J. Bambus & Company felt helmets.
The reason the original liner in this helmet looks strange is because at the 2 o'clock view there is a piece of the liner that is either cut out or damaged and missing between the fingers. I see wear and use on edge of the leather liner where it meets the edge of the helmet shell.
The helmet shell is typical J. Bambus & Company mfg, and the liner looks to be typical J. Bambus & Company mfg as well.
The liner looks to me like it might be maker marked "J. Bambus & Co." on the 12 o'clock area of the photo of the liner. I currently have an unmarked felt J. Bambus & Co. helmet in my collection, and unfortunately I used to have one of these that was maker marked on one side of the leather liner above the ear area on one side. It looks like this one might be maker marked in this area as well, as they sometimes are by J. Bambus.
Steve: Ask seller for a better photo of that 12 o'clock area in the liner that we can't see very well due to the angle of the photo.
Best Regards,
Alan