On 10 September 1914, a shipment of mail left Rabaul aboard the steamer Kalili bound for Germany.  This shipment contained Feldpost items and civilian mail from Rabaul and Herbertshöhe.  Cancels dated from 10 August 1914 to 8 September 1914 are known.  Kalili then picked up mail in Maron on 15 September 1914.

Most of the mail from Rabaul and Herbertshöhe was censored.  Censored covers were re-sealed with blue, circular Rabaul official seal labels.  Censor marks were either manuscript marks or a handstamp with the day handwritten into the blank, signed by the censoring official — Herr Toelke, Herr Weber, or Dr. Bredemann.

The handstamp text states:

“Gouvernementsseitig / unter KRIEGSRECHT geoffnet / Rabaul, __ Septemb. 1914. / Uberwachungsoffizier:”
(Opened by the government under martial law, Rabaul, __ September 1914.  Censoring officer:)