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- Source is exactly "The William E. Boeing Sr. Papers (2005-10-06-B), Box 4, Folder 27"
[First flight air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, June 21, 1947]
![[First flight air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, June 21, 1947]](https://digitalcollections.museumofflight.org/files/square_thumbnails/d941cf755e9911107c3548a0dfc74b5e.jpg "[First flight air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, June 21, 1947]")
First flight air mail cover addressed to Bill Boeing, Jr., Seattle, Washington, June 21, 1947.Stamped cachet: "First Flight A.M. 3 from Bozeman, Montana - Northwest Orient Airlines."Stamped cachet: "U.S. Air Mail, First Flight, Bozeman, Mont."Stamped…