See also https://asiamedals.info/threads/194...raduation-commemorative-watch-fob-1942.27566/ ; https://asiamedals.info/threads/arm...ics-graduation-commemorative-watch-fob.27626/
Private collection. Photos courtesy of the owner.
Obverse
關機 - Engine
reverse
2602 - 1942
陸軍航空整備學校 - Army Aviation Maintenance School
第二十六回機関學生卒業記念 - 26th Engine [Mechanics] Student Graduation Commemorative