Size 25 x 30 mm.
Weight 7 g.
Reverse
第一潜水戦隊 - First Submarine Squadron http://hush.gooside.com/Order/GF/ss.html
昭和九年 - 1934
Original case.
Watch fob was made by Hattori workshop https://asiamedals.info/threads/history-labels-i-marks-of-hattori-watch-shop-tokyo.19361/
Later badges of 2nd design
Early badges of 1st design https://asiamedals.info/threads/naval-academy-award-badges-of-1st-design-pattern.30363/.
Obverse
賞 - Award
reverse
海軍兵学校 - Naval Academy
In the center
勝て兜の緒を締めよ = 勝って兜の緒を締めよう
"After victory, tighten your helmet cords" i.e. even...
award badges
imperial japan naval academy
japanese imperial navy badge
japanese naval badge
japanesenavybadges
勝って兜の緒を締めよう
勝て兜の緒を締めよ
海上自衛隊呉教育隊バッジ
海上自衛隊呉教育隊章
海軍兵学校章
海軍兵学校賞章
海軍兵学校體操體技賞章
體操體技賞章