First Flying Mail Car Envelope (1946) comic books
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This envelope was a promotional item to commemorate the first flight of United Airlines Route AM No. 1. On the front of the envelope is a postmark from Omaha, NE dated October 1 at 5 PM. On the back of the envelope is a postmark from Denver, CO dated October 1 at 10 PM. Empty envelope measures 6 3/4-in. x 3 3/4-in.