Good observation Joe. Carrying the logic a step further, the reason the 116th used that device was the fact that the Kaiser was their Colonel In Chief, hence their title Kaiser Wilhelm's Infantry. He "owned" them too.
I truly think this item is somehow associated withn the Kaiser. I have seen other personal items marked with the royal monogram (a silver cup with the monogram of Mad Ludwig springs to mind), obviously to identify their personal property. I'm wavering on whether to acquire it though. The price is very reasonable and it is a neat item, but it may be too esoteric for me.
Steve