cover 1931, 4m Polar Flight (C42, Michel 458), tied by Friedrichshafen c.d.s. on Zeppelin Polar Flight cover to the U.S. (Sieger 119C) with overall printed cover cachet in green, Ice Breaker Malyguin and red flight cachets, purple Malyguin backstamp, very fine, Sieger DM750, Michel DM2,300 photo