At this moment it is my opinion the black shoulder-strap may not have been used in SWA,
but in Germany itself.
The reason could be: many boys and girls from SWA were in Germany through the years
to learn a profession. July 16, 1935 they called for a meeting and instituted at Goslar, in Germany,
the "Landmannschaft Südwestafrika". In late 1939 they had about 650 members (boys and girls).
Maybe the youngest did wear the HY-uniform with HY-service with special insignia, as for example
the triangle "ReichsdeutscheJugend Ausland", as was worn also in Germany at the "Jugendhof" at
Rheinsberg in the Kurmark (see my handbook, page 594).
This is only a thought and my personal opinion. What I know is that they did wear the white triangle-
badge with red edge, as used in SWA: "Der Dornen und des Durstes", the badge with the stylized
"Weissdorn" (see included image),
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but the members from the earlier mentioned "Landmannschaft Südwestafrika" did wear this badge
also, but their version did have included the swastika. The badge with swastika was in SWA
forbidden. In most known books the purpose for the version with swastika is wrongly explained.