Details
cover 1931-51 selection of covers and cards, including 1931 (30.1) Dornier-DO X flight cover and card showing special cancellations, 1931 Zeppelin Polar Flight 1m. affixed to special "Polarfahrt" card, with Leningrad d.s. alongside; also Berlin, West Germany 1951 Lubeck Church set on a plain cover, etc. (16)