Biscuits "UNION-KEKS"
Packaging biscuits Hanoverian firms Bahlsen (those the most, that produce Leibniz) issuing wartime.
The packaging has an interesting system of fixing the lid.
On the ends there is an inscription:
"Verkauf nur gegen Rückgabe einer leeren Packung für die Altmaterial-Sammlung", which translates as:
"Sold only on the condition of returning the empty package to the point of reception of scrap materials", which is logical in order to save in German industry in the conditions of warfare.
Inside the package 15 authentic cookies with the inscription BUTTERKEKS

Original box: