1937 China Clipper First Flight Cover Guam to Macao, April 22

Cover flown on the April 22, 1937 China Clipper leg from Guam to Macao, with illustrated black cachet showing tropical island scene and Pan Am seaplane. Guam postmark ties 50 and 20 airmail stamps; reverse bears matching Guam-to-Macao cachet and Macao arrival handstamp. Addressed to Olympia Hotel, Macao. Scarce segment on the transpacific route.