German aluminum bread/sandwich tin. It is in decent condition with some dents and dings. It looks like it was pried open at some point. A good bread bag stuffer to keep your sandwich safe. These were an important part of everyday life for Germans, so it is no wonder they found their way to the front lines as well. They were even being produced as early as WWI.
They are pictured on the cover of the 1939 Der Sportler catalog.
