I have one of these snapped together helmets.
No liner left in it, but you can see the spike is steel rather than brass, and the super thin brass wappen is attached with a single screw through the center of the eagle rather than with the peg through a slot like earlier ones.
The back of the wappen has never had a peg mount soldered onto it, and the original paint corresponds to the to wappen outline. So, screw attached only.
I think this type may have been made at the end of production for these helmets.