I found a bunch of coins in my grandfather's WWII military stuff and I have been able to identify all of them, except this one. I know that he traveled around the world as an airplane mechanic. He had an Australian 1910 Florin (not in very good shape and barely readable) and an Egyptian 1917 5 Milliemes coin in with this bunch of coins - just to give you an idea of where he was. I believe the coin is Japanese, but I am not really sure. Any information at all would be greatly appreciated. Thank you!
