I must add that my JR115 helmet pictured here has exactly the same maker stamp and date as R1's helmet (I had also posted this mark on the forum some time ago). Still, they have different spikes...
When I found this helmet it had probably been untouched since the war (I have pictures somewhere). However, the spike had been grossly welded to its basis. I wonder why. A friend of mine took time but managed to get rid of that blackened pewter, which is now completely gone.
Bruno