1931, Polar travel, handing in for transport Friedrichshafen to Leningrad, letter with 2 RM. Polar travel from "FRIEDRICHSHAFEN 24.7.31" to Göttingen with arrival postmark Leningrad from 25. July and appropriate Cachet, well perforated, minimal old tinge in the perforation, cover on face trace of glueing, fine example (former starting price 140) ;