SA: 1933 UNION AIRWAYS: FIRST RETURN FLIGHT Johannesburg to Durban printed envelope franked pair 4d Airs (SG 40var) - varieties SHORT "I" (right stamp) and WHITE SPOT BETWEEN "A" & "F" (left stamp). Postmarks departure cds 3 JAN and arrival Durban same date. SIGNED BY PILOT G.W. BELLIN. Only 423 letters carried. Scarce.
