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South-West
Africa is the former name of Namibia.
It was a German possession and
later (from 1915) South African administration
after it was conquered from the Germans during World War I.
See: Namibia stamps
Scott: #81-3O
Issued: 1.1.1926
Definitive; Overprint
Inside #81-3:
Non-Postal S/s for SWA Nat’l. Phil. Exhib.
showing German stamps #37-42
Thanks to Lloyd Gilbert