The Answer to the Whatzis.
Eric finally got it. It's the "glasflasche" or glass bottle, that contained the "clark" poison gas in a German WWI 77mm shell.
Like in this picture.

Congrats to working your way through the problem. Of course, it was an *easy* one for this collection of geeks!
And no, I am *not* the John who posted it on Gunboards.
For more information on the subject - read the document that finally pulled it together for Eric.
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