Obverse
防空 - Air Defense
reverse
勤功章 - Diligent Service Badge
昭和九年乃至 - From 1934
十三年度防空演習 - Until 1938 Air Defense Maneuvers
高見防護分團 - Takami Air Raid Defense Corps
Case.
Label of H.K.D. workshop https://asiamedals.info/threads/badges-and-watch-fobs-made-by-h-k-d-workshop.22291/
See also badge with similar design of obverse https://asiamedals.info/threads/1937-hanshin-air-defense-maneuvers-tanabe-youth-group-badge.24124/