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Typical Japanese bomb marking (Tokyo).
The image was taken from TM 9-1895-4/TO 39B-1A-11 - Japanese Explosive Ordnance (Bombs, Bomb Fuzes, Land Mines, Grenades Firing Devices and Sabotage Devices). (1953). Retrieved from http://bulletpicker.com/pdf/TM%209-1985-4,%20Japanese%20Explosive%20Ordnance.pdf