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- Subject is exactly "Martin (Glenn L.) JRM Mars Family"
[First flight air mail cover addressed to William E. Boeing from Glenn L. Martin Company, July 3, 1942]
![[First flight air mail cover addressed to William E. Boeing from Glenn L. Martin Company, July 3, 1942]](https://digitalcollections.museumofflight.org/files/square_thumbnails/2f875a1e3dcc3347719a0c7c61de4681.jpg "[First flight air mail cover addressed to William E. Boeing from Glenn L. Martin Company, July 3, 1942]")
First flight air mail cover addressed to William E. Boeing, Seattle, Washington, from the Glenn L. Martin Company, Baltimore, Maryland, July 3, 1942.Stamped cachet: "First Flight - This cover carried on first official flight of the 'Mars,' built by…