Lot 2436
 
Austria 1931 Polar Flight, Friedrichshafen - Berlin (Michel 202 a), cover franked with four airmails tied by Vienna c.d.s.s, 21.VII.31, Friedrichshafen 24.7.31 transit postmark, red Zeppelin flight cachet and Berlin-Staaken 24.7.31 receiver on front, also purple boxed airmail postmark, Very Fine, very few flown. Sieger 119 D.
Michel €400 ($430)
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