Michael.
The metal item appears to be some sort of plumbing connection that screws in at one connection (threaded end) and is soldered to other connecting pipe. I can't say what the two circular items are.
This is indeed an inkwell (with the groove in the glass being a friction type of hold for the accompanying pen). No doubt this inkwell provided the fuel for countless SS Soldbuch and Wehrpass entries....nice find.....
mass graves in ex-USSR and in the death camps were dug years after the war to "find the gold of the Jews".
Many secret diaries from (killed) Jews in the Einsatzkommandos that were hidden to provide testimonies of the killings were destroyed during this period.
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