皇紀2603年第十六期高等科航空兵器術雷爆練習生卒業記念章

See also https://asiamedals.info/threads/16th-advanced-course-of-aviation-weaponry-aerial-photography-graduation-commemorative-watch-fob-2603.27189/ Obverse 高雷爆 - Advanced [Course in] Explosives reverse 皇紀2603年 - 1943 第十六期高等科航空兵器術 - 16th Advanced Course of Aviation Weaponry 雷爆練習生卒業記念 -...