Stamp on the belt

[zeppelin]

Friends, who can decipher the stamp 13 K.M.W?

[kabl]

Hello z,
In my opinions stands the' 13.K.M.W' for the
13.Kompanie Minen Werfer..
MWK 13 – GenWiki

Officially M.W.K 13, here in the belt probably made unofficially 'on the troops'

Best regards,
The kabl