Hello Guys,
According to the previous owner, a German, the mening of the abbreviation means
Kl.Wk.= kleine Waffenkiste
This is in accordance with the Ron interpretation.
Did you notice that the box has two fastens for the belt. It was possible to carry the box with a belt around the shoulder in order to have the hands free.
I have added some pics of this particular and you can see that the belt connection is still around the fasten.
In addition a photo of the top of the box where it is possible to see the date 1938 and the waffenamt.
Cheers,
Mauro