SOUTH AFRICA → SOUTHWEST AFRICA airmail cover from Pietersburg to Windhoek with Pietersburg 30 Jan 1932 datestamp on front.  Cover was part of first return flight of the Windhoek-Kimberley service with Johannesburg 1 Feb 1932 datestamp and 2 Feb 1932 arrival datestamp of the Windhoek special FIRST AIR MAIL canceller at the back.