1933 (May 29-30), Italy Flight registered cover from Athens to Germany, franked by five stamps, including Zeppelin complete set of three, tied by Athens ''27.V.33'' ds, Rome (29.V) machine connection, blue confirmation cachet and green Friedrichshafen ''30.5.33'' arrival marking, VF, Sieger #210y, €1,000, Est. $500-$600 (Image)