Date of birth:

May 1st, 1904 (Leiden/South Holland, Netherlands)

Date of death:

(Coral Sea near Grafton Passage, Australia)

Nationality:

Dutch

First mate ss Sibigo

Sailing near Grafton Passage (Australia), the Sibigo was lost in a heavy cyclone on 16 March 1945. 63 crew members, including Koster, lost their lives.

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• - POLDERMAN, K. & RUITER, H. DE, IN MEMORIAM, VOK, Amsterdam, 2020.
  - Johan Willem Koster | Oorlogsgravenstichting
  

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