1931, Polar travel, Friedrichshafen to Malyguin, letter with 4 M. Polar travel from "FRIEDRICHSHAFEN 24.7.31" to Genthin with arrival postmark, arrival Malyguin 27. July and Corresponding Cachet, stamp well perforated, small glueing creases above, cover to the margins compressed and small tears left and right, high-value franking