1940 China Clipper FF Cover San Francisco to Canton Island, South Pacific

Airmail cover carried on the July 12, 1940 inaugural China Clipper flight from San Francisco to Canton Island in the South Pacific. Features blue cachet showing Clipper plane and island landing scene, with multicolor franking totaling 30. All stamps are tied by San Francisco machine cancel. Clear Canton Island receiving mark dated July 14, 1940 on reverse. A clean and attractive example from Pan Ams expanding transpacific service.