Two 50s posters by Henri Ott From "Rare and Important Travel Posters" auction from Swann Galleries, New York, 2013 HENRI OTT (1919-?) SWISSAIR / BY SWISSAIR TO THE UNITED STATES / DOUGLAS DC - 6B. Circa 1952. HENRI OTT (1919-?) SWISSAIR / BY SWISSAIR TO THE UNITED STATES / DOUGLAS DC - 6B. Circa 1952. +Swann Auction Galleries