South Africa 1932 Imperial Airways Cape Extension SWA, Signed

SA: 1932 IMPERIAL AIRWAYS Inaugural Flight First Regular Airmail Cape Town - London: January 27th, EXTENSION TO WINDHOEK VIA KIMBERLEY Envelope franked 4d Air tied Cape Town cds 27 JAN with Kimberley, Grootfontein & Windhoek backstamps. SIGNED BY PILOTS, CAPT RF CASPAREUTHUS and CAPT AO WRIGHT, the latter of SWA Airways. VF, a scarce signed cover thus.