Philately. 3 letters, delivered 1. flight AUSTRALIA - N.EW ZEALAND 4.34 franked. i.a. SG.115, 139 CDS SYDNEY, on NZ additionally franked i.a. SG.550 airmail 7P CDS AUCKLAND and sent back, resp. from Vienna (2x); all very fine (Image 1) (Image 2) (Image)