Unit Markings on 1917 Navy

Wolf, Jan Still's "The Pistols of Germany & it's allies in two world wars" page 93 shows your SW II as an unknown marking and Joachim Gortz's "The Navy Luger" doesn't show it either. Is it possible that some of your German navy archives may refer to any Naval units stationed in the colony (prior and during WW1) of South West Africa? Please let us know if your find any documentation.