cover China flight covers, 21 different covers, virtually all are first flight covers with various frankings, incl. some better covers: two April 1937 first flights (Shanghai-Hawaii and Shanghai-Manila), both have large green flight cachets, another is first flight by China Clipper (Shanghai-Hong Kong-S.F.), 1936 R.A.F. courtesy flight to Hong Kong, 1934 flight cover from Japan to Hong Kong, 1926 'U.S. Air Service' flight cover from Shanghai to Honolulu and 1936 first flight cover from China-Europe (via Hanoi), worthy of careful examination, fine-very fine lot