This is a very unusual and rare item of postal history with a Labuan connection. It was posted at Angaur which is the southernmost island in the chain of islands called the Carolines in the western Pacific to the north of New Guinea. It is now known as the Republics of Palau.
Historically, they were claimed by the Spaniards in 1528 and became part of the Spanish East Indies and were also known as the New Philippines, being governed from Manila. After their defeat by the Americans, Spain sold these islands to Germany in 1899. They were under German administration as part of German New Guinea until their defeat in WWI in 1918.
The island of Angaur was very rich in organic phosphates which were mined between 1909 to 1954. This card was definitely sent by one of the expatriate employees there. It was believed that there were several routes for mail to travel from the Carolines to Europe depending on the trade routes used by visiting German steamships. One of these routes was suppose to involve the regular visit of Angaur by one of the NDL ships which served Singapore, Labuan, North Borneo and Zamboanga in south Philippines. It has been said that this was monthly schedule. But there is no evidence to support this at all. As far as records in the BNBC Herald shows, the service only went as far as Zamboanga.
It was written on 7 March 1909, posted on 9-3 09 and transited Labuan on 19 MAR 1909 and Singapore MR 29 1909. A ship journey of 10 days between Angaur and Labuan was very fast even for nowadays. Moreover, looking at the shipping information on shipping arrivals and departures from Sandakan, I am unable to trace the ship with the right timing at Sandakan nor the journey to Labuan. The transmission of this card is not that straightforward.