This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
US to Guam First Flight Cover . en Flown cover carried both directions on the first commercial flights between San Francisco CA and Guam Guam October with Pan American Clipper cachets Air Mail route FAM Aircraft Sikorsky flying boat Pan Am Clipper NOTE The cover was addressed to US Rep John Buckbee RIL private collection Stamps