What, pray tell, might these be?
They are of Great War vintage, of course, German, one is flat, and one isn’t.
They both have the same use but were not used together.
And they are not part of something, like a part of a field gun, but to be used they did have to be attached to something else. These devices are different models of exactly the same thing, and are no more and no less than what you see. Which is all you are going to get from me. Apart from the fact that you know many of my specific Great War interests by now. Which may or may not be a red herring. Have fun.