carried on the Germany flight, March 26-29, 1936 (in convoy with Hindenburg, distributing propaganda), comprising: one bearing four airmail stamps, postmarked Friedrichshafen, March 26, addressed to Pennsylvania; a second with 11 definitive stamps and one airmail, postmarked Friedrichshafen, March 23, addressed to Berlin; the third with single airmail stamp, postmarked on the airship, March 29, addressed to Friedrichshafen