It's an older type (before 1897) helmet and maybe the chinscales were replaced when the Reichskokarde was added, I don't know. Anyway they appear to be a younger model than the helmet. No problem with the liner imo. So all in all a nice helmet, regarding that the pictures should be better than the ones provided...
It can be a good deal but that will all depend on the price, Prussian Infanterie helmets are not that hard to find and so they are not that expensive...
Adler 1