LIECHTENSTEIN: 1931, trip to Hanover, handing in for transport Friedrichshafen, cover with 2 Fr. Prince and Princess as well 25 and 45 Rp. airmail from "TRIESENBERG 12. VI. 31" to Berlin with arrival postmark Hanover from 14. June and appropriate Cachet, rarer incoming line with good franking (Michel no. 107, 110, 112), expertized simon BPP with in detail photo expertize "the document is genuine and perfect quality, through his franking höherwertig[er] as normal connecting flight mailings. "