1923 printed matter sent to Lehnkering in Duisburg Germany of the <a href="https://en.wikipedia.org/wiki/nl:Nederlandsche_Stoomvaart_Maatschappij_Oceaan" class="extiw" title="w:nl:Nederlandsche Stoomvaart Maatschappij Oceaan">Nederlandsche Stoomvaart Maatschappij Oceaan (Dutch steamship company 'Ocean')</a>, a subsidiary of the <a href="https://en.wikipedia.org/wiki/Blue_Funnel_Line" class="extiw" title="w:Blue Funnel Line">Blue Funnel Line</a>. Ships of the Blue Funnel fleet all had names from classical Greek legend or history. Reverse of the card a 1923-11-02 schedule in German.
Nederlandsche Stoomvaart Maatschappij 'Oceaan'
Self-scanned