Army postal service 1918, illustrated card (Mariehamn / Norra Tullen) as fieldpost card with postmark \"KAIS. German Navy Ship Post number. 176\" the S. M. W. S BOSNIA to Eddelak / Dithmarschen, the German language Alanddetachement subsisted characteristic fieldpost offices, the land units could also the navy ship+eãs mail Use. Extremely rare commercial usage, only three months possible