1940 Sonar Specialist Training Commemorative Watch Fob/皇紀2600水測特技兵講習員修業記念章

Obverse

水測 - Hydroacoustic/Sonar

reverse

皇紀2600 - 1940

水測特技兵 - Hydroacoustic/Sonar Specialist

修業記念 - Training Commemorative

講習員 - Trainee

 

Another example.