ZEPPELIN COVERS: Nineteen covers, five postcards and two fronts with various GRAF ZEPPELIN and HINDENBURG, flights including America Flight 1929, Egypt 1931, South America 1931, 1934, 1935, 1936, 1937, 1938, North America 1936, including C36-C36, C37 (2), C39 (2), etc, many with toning due to sulfur-based gum. Inspect. (Image)