Austria, 1931 Polar Zeppelin Flight, red cachet handstamp on 10g view postal card uprated with 1929, 50g + 2s View issues + 1930, 80g Airmail tied by "Innsbrook, 22.VII.31" cds's, Freidrichshafen transit and Malyguin receiving postmarks, Very Fine. 2000 Frost No. 127-127 $300. Estimate  $75 - 100. $0 (Image)