Lot
285 
Russia, (Russia) 1931 Polar Flight, July 24-31, with 1931 30k-2k Polar Flight Zeppelin imperf. issue complete (C26-C29) tied on registered flight cover by "Leningrad, 25.VII.31" circular datestamps, red German flight cachet and three-line violet cachet, Moscow circular datestamp, a Very Fine and scarce with the complete set. Sieger Nos. 120 Bc. Estimate $400 - 600.
Realized: $425