1931, Zurich trip, board mail with additional cancel the "MOPHILA Hamburg", picture postcard "dispatch of the postal service for the airship 'Count Zeppelin' " with 1 RM. Polar travel from "airship Count Zeppelin 11.9.1931" to Flensburg with arrival postmark Zurich from 11. September, not so fresh and crease right, but unusual high-value franking;