I was listing this on our website tonight and thought I should add it here as it is such a cool flag.
Japanese Osaka Mainichi Press Cross Pacific Flight 1939 Flag. Cotton body, with foil like corners. Roughly twenty-seven by thirty-nine inches. Great printed graphics. The characters roughly translated it reads OSAKA MAINICHI PRESS FLY AROUND THE WORLD, CROSS PACIFIC 1939.
There was also a newspaper in Tokyo at same time that sent their plane ( divine wind) also on a cross Pacific / around the world flight, in competition.