Pickelhaube model 1915 for Bayern Infantry.
On the helmet front there is the Bavarian infantry wappen visible. On the side view – the Bavarian standard cockade in white and blue colours.
On the helmet skull there is difficult to read but visible manufacturer’s stamp Alexander Dahl Helmfabrik -Barmen, Ritterhausen.
The rear visor of the helmet is stamped 3.J.R for Königlich Bayerisches Infanterie-Regiment „Prinz Karl von Bayern“ Nr. 3 located in Augsburg.
The lining looks similar to the pre war pickelhaubes. The last photo showes helmet with removed top spike.