1912 / 39, collection from almost exclusively Zeppelin covers and cards, with also 2 catapult mail letters and a DOX letter, many good frankings like D. R. Michel number IV (4), VI, 438 (5), 439 (2), 456, 457 (2), 458 (2), 496 (6), 497 (2), 498 (2) and so on