Germany: Federal Republic, 1931, Airmail, 1931, 1m, 2m and 4m Polar Flight Zeppelins used separately, group of three with appropriate 1931 Polar Flight cachets comprising C40 on 1931 polar flight post card, C41 on post card, and C42 on cover, small faults, F.-V.F. Scott Nos. C40, C41, C42  Estimate $300 - 400. $0 (Image)