16th Advanced Course of Aviation Weaponry 1943 Graduation Commemorative Watch Fob/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/16t...raduation-commemorative-watch-fob-2603.27189/

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高雷爆 - Advanced [Course in] Explosives

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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 - Explosives [Bombs and Torpedos] Trainee Graduation Commemorative