Switzerland: 1929, Holland trip, handing in for transport Friedrichshafen with droped Amsterdam, card from St. Gallen 11. X. With airmail postage and on face both special arrival postmarks from Amsterdam, addressed to Berlin, all postmarks on face and in perfect condition, according to in detail photo expertize leather International Association for Philatelie Experts (2010) are so far only two cards with both arrival postmarks recorded, extreme scarce variety!