1937 China Clipper First Flight Cover Hong Kong San Francisco, 5-Stamp Franking

Airmail cover carried on the April 29, 1937 China Clipper return flight from Hong Kong to San Francisco. Features printed blue FAM 14 cachet with flying boat illustration and Received First Flight handstamp. Franked with five different Hong Kong stamps, all tied by matching airmail cancels. Backstamped in San Francisco and marked by the sender's stamp company. A visually appealing example of the return leg across the Pacific.