1942 Naval Mine School 16th General Mining Course Graduation Сommemorative Watch Fob/2602年海軍機雷学校第十六期普通科機雷術練習生卒業記念章

11th class watch fob https://asiamedals.info/threads/194...raduation-sommemorative-watch-fob-2600.29492/;
21st class watch fob https://asiamedals.info/threads/nav...rse-graduation-sommemorative-watch-fob.27194/;
23rd class watch fob https://asiamedals.info/threads/nav...rse-graduation-sommemorative-watch-fob.28984/.

Obverse

普機雷 - General Mining [Course]

海軍機雷學校 - Naval Mine School

reverse

2602年 - 1942

海軍機雷學校 - Naval Mine School

第十六期普通科 - 16th General Course

卒業記念 - Graduation Сommemorative

機雷術練習生 - Mining Trainee

 

Another example.