SA: 1929 Union Airways FIRST FLIGHT EAST LONDON to DURBAN, the letter redirected on arrival to Red Hill. Registered envelope franked 9d adhesives tied ovals of AU 26 with front showing also registration cachet. Superb range of backstamps. SIGNED BY PILOT CAPT RF CASPAREUTHUS. Only 10lbs 3 oz mail carried, few registered / signed, scarce.
