Hey Brian, I missed that it was missing the grommets, that would indicate that the helmet was completed as an M1895, but had the brass removed to upgrade it to am M1915. I had a Great Aunt from near Strassbourg, and she told of the Germans withdrawing from her village, and taking everything made of brass with them, her mother was very happy that German soldiers were in their house even removing the brass tacks from the floor, when she asked her mother why she was happy, her other explained that it meant the war would be over soon, because if the Germans had to scrounge for brass tacks, they were beaten. I would bet that the brass grommets were removed to recover the metal.
Best
Gus