Germany, Airmail, 1931, 1m-4m Polar Flight Zeppelins complete. Well centered set with rich colors, tied by "Berlin, 29.8.31" cds on South American round flight cover, with red Berlin and green Rio De Janerio connecting flight cachet handstamps, Very Fine and choice. Michel No. 456-458. Scott No. C40-C42  Estimate $600 - 800. $0 (Image)