This is a beautiful stamp souvenir sheet, issued by Togo in 2010, displaying dirigibles. Featured airships shown include Lennox's Eagle 1843 airship, Croatian aviation pioneer David Schwarz's first flyable rigid airship from 1897, the Norge N-1 polar expedition airship, the Albert & Gaston Tissandier brothers 1883 airship, and balloonist Thomas Scott Baldwin's 1896 California Arrow dirigible. The sheet is Yvert&Tellier catalog #431, and is Post Office fresh, mint never hinged, and F/VF.