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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 3, Folder 76"
[Air mail cover addressed to William E. Boeing, Seattle, Washington, from Black and Bigelow, Incorporated, New York, August 2, 1928]
![[Air mail cover addressed to William E. Boeing, Seattle, Washington, from Black and Bigelow, Incorporated, New York, August 2, 1928]](https://digitalcollections.museumofflight.org/files/square_thumbnails/e23d6ac98f360d32d79c8b6babff24b5.jpg "[Air mail cover addressed to William E. Boeing, Seattle, Washington, from Black and Bigelow, Incorporated, New York, August 2, 1928]")
Air mail cover addressed to William E. Boeing, Seattle, Washington, from Black and Bigelow, Incorporated, New York, August 2, 1928. Commemorates the "inauguration trip of the five cent air mail."Stamped: "Inauguration trip of the five cent air mail."