Rare German carbon monoxide indicator (Kohlenoxydanzeiger) wooden carry crate nice solid condition found on a flea market in Berlin April 1945 battle

This is a rare to find German carbon monoxide indicator test kit or in German (Kohlenoxydanzeiger) wooden carry crate in nice condition with no large amount of damage.  The box still retains its original markings fairly clear to see and has been over painted in red paintwork, both hinges in nice condition and also has its carry handle and has waffen stamp maker mark on the side of the box. The lid still opens and closes perfectly and locks the box comes from a flea market in Berlin

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