1931, Polar travel, handing in for transport Friedrichshafen to Malyguin, letter with 4 RM Polar travel from "FRIEDRICHSHAFEN 24.7.31" to Wiesbaden Biebrich with arrival postmark Malyguin from 27. VII. 31, stamp with individual minimal shortened tip left, otherwise well perforated and faultless, cover at the bottom horizontal fold trace, high-value franking, expertized Peschl and Schlegel BPP