German steel box

[Luft]

Hi all,
I have a German box that my grandfather brought home from the field after World War II, so it is 100% original. was buried in 2000 with alcohol, because no other box was on hand, once I learned it was a box from World War II, so I insisted that it be dug up and alkhol was inserted into another and today, after dug up at the age of 20 it was unfortunately dug up unfortunately the condition corresponds to 20 years in the soil fortunately it was wrapped in plastic wrap.
[SORRY FOR TRANSLATE]
I'd like to ask for help if anyone knows what the box was for
Thanks for help
Luft

[steger]

Hello

That's WH chest-thermos.