US #C21-22 China Clipper FDC - 1937 Combination First Day Cover

With the ability to land in water, the China Clipper inaugurated Trans-Pacific air travel in 1935. In 1937 service was extended to Hong Kong and China, and the 20¢ and 50¢ values for the new rates are combined on this scarce first day cover. Cachet artwork may vary.(US #C21-22 FDC)