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