Well, its out of the ordinary, that's for sure. Main phrase at the far right is
無敵部隊 (Invincible Force)
Above the figure is
萬々歳 Ban ban zai (10000 x 10000 years)
祝戦勝 Iwai senshō (Victory in battle)
It looks like it came from the office of a newspaper located in Korea (Japan-occupied Korea) called Chosen Nichi-nichi. I don't know if this was presented to anyone, or was just a patriotic token in the office. Every entry on the flag is a patriotic slogan, with someone's name and personal stamp under it.