1937 China Clipper First Flight Cover Guam to Macao, April 27

Cover flown on the April 27, 1937 China Clipper segment from Guam to Macao, with Guam postmark and clear receiving mark on reverse. Features bold black cachet for the FAM 14 Guam Macao leg, and franked with 10, 20, and 5 U. S. airmail postage. Neatly addressed with light toning from original gum. A clean example of this mid-route flight.