Air Mail cover 1930 (9 Dec.) U.S. Navy cover to Hankow bearing Air 15c. and Junk 4c. (defective) tied by Shanghai c.d.s. and is endorsed "Original cover from Shanghai/Hankow plane of Dec. 9th which crashed killing Baer, the pilot, the Chinese co-pilot & 1 passenger" and is backstamped Hankow for the same day.

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Air Mail cover 1930 (9 Dec.) U.S. Navy cover to Hankow bearing Air 15c. and Junk 4c. (defective) tied by Shanghai c.d.s. and is endorsed "Original cover from Shanghai/Hankow plane of Dec. 9th which crashed killing Baer, the pilot, the Chinese co-pilot & 1 passenger" and is backstamped Hankow for the same day.