Date at the bottom says Showa Juninen. That makes it 1937.
It's a Japanese commemorative coin, commemorating something about China. Can't make out all the writing as the eyes are not as good as they used to be and the red "TAPIR" get in the way.
If you can post a more magnified photo of just the side with the bomb and not put the red watermark on it, I may be able to give you more details.