japanese air defense badge

See also another badge with similar design https://asiamedals.info/threads/1936-yokohama-city-naka-ward-air-defense-corps-officer-preparatory-training-badge-a.27535/ Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Reverse 關東防空大演習参加記青木聯合會 - Kanto Large Air...

See also https://asiamedals.info/threads/1933-kanto-large-air-defense-maneuvers-koishikawa-ward-air-defense-corps-participation-commemorative-badge.25039/ Size 34.5 x 30.5 mm. Thickness 2.6 mm. Obverse 關東防空大演習記念 - Kanto Large Air Defense Maneuvers 参加章 - Participation Badge reverse...

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Obverse Army star + 守れ郷土の空を- Protect the Sky of Your Hometown Badge

Obverse Army star inside Tokyo city emblem 功 - Merit reverse 表彰 - Commendation 京橋區防護團 - Kyobashi Ward [Air] Defense Corps 昭和十四年二月十一日 - February 11, 1939 Original case. 表彰 - Commendation 京橋區防護團 - Kyobashi Ward [Air] Defense Corps Badges were manufactured by the Oki Medal Company...

Obverse Inside Tokyo emblem 防 - Defense reverse 中野區防護團 - Nakano Ward [Air] Defense Corps 第四分團 - 4th Team /Branch/ 功勞章 - Merit Badge 紀元二五九七年 - 1937

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Obverse 防護團員 - Defense Corps Member reverse 神奈川區 - Kanagawa Ward 防護團員章 - Defense Corps Member's Badge

Obverse 中四 - Chūshi /4th Middle/ 大阪防諜委員会- Osaka Counterintelligence Committee Member Marked 純銀 - pure silver.

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Obverse 記念章 - Commemorative Badge Army star inside Tokyo emblem. reverse 淀橋區防護團 - Yodobashi Ward Air Defense Corps 落合第一分團 - Ochiai No.1 Branch 昭和十一年十二月 - December 1936 分離記念 - Separation Commemorative

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Obverse 近畿防空演習 - Kinki Air Defense Maneuvers 参加 - Participation 記念 - Commemorative 昭和九年七月 - July 1934 reverse 住吉区下茶屋 - Sumiyoshi Ward, Shimojaya 防護分團 - Air Raid Defense Corps Branch

Obverse 防空 - Air Defense 賞 - Award reverse 昭和十一年防空演習 - 1936 Air Defense Maneuvers 荏原區第二分團 - Ebaraku Ward [Tokyo] No.2 Air Defense Corps Branch

Badge with the same design but from a different Corps https://asiamedals.info/threads/1934-kinki-air-defense-maneuvers-kitaura-air-defense-corps-branch-participation-commemorative-badge.25054/ Obverse Emblem of Chudai Air Defense Corps Branch with 中 in the center 中大 - Chūdai 防畿 - Defense...

1st variation. Obverse 防空 - Air Defense reverse 昭和十一年度阪神防空演習 - 1936 Hanshin Air Defense Maneuvers 済美朕合防護團参加記念章 - Saimi Air Raid Defense Corps Participation Сommemoration Badge

Obverse 防空 - Air Defense reverse 紀元二千五百九十四年 - 2594 = 1934 下山手分團 - Shimoyamate Bundan /[Air Raid Defense] Corps/

Badges with similar design were commissioned by Shitaya Ward Air Raid Defense Corps https://asiamedals.info/threads/shitaya-ward-badges-for-participants-of-air-defense-maneuvers-in-kanto.23247/ Size 26 x 34 mm. Reverse 昭和十一年七月 - July, 1936 三市聯合防空大演習 - Three Cities Joint Air Defense...

Obverse Army star inside Tokyo emblem. reverse 昭和十三年九月 - September 1938 記念章 - Commemorative Badge 澁谷區防護團 - Shibuya Ward Air Defense Corps 大向分團 - Ōmukai Branch

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Suspension 昭和十一年十月度 - 1936 防空演習 - Air Defense Maneuvers obverse 浅草區防護團正徳分團 - Asakusa Ward (Tokyo) Air Defense Corps Shōtoku Branch 精勤章- Diligence/Good Attendance Badge

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Obverse 防空 - Air Defense Osaka city emblem reverse 昭和十年十月 - October 1935 参加記念章 - Participation Commemorative Badge

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Obverse 防名 - Nagoya City Defense (most likely 名 for 名古屋市 - Nagoya City) reverse 2597 = 1937 高須部隊 - Takasu Unit

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. Obverse 表彰 - Commendation; Award 青 for 青年団 - Youth League https://asiamedals.info/forums/youth-league-seinen-dan-badges.618/

Specimen from the collection of Raymond LaBar. Photos courtesy of the owner. It could also be related to Civil Defense Corps /Keibodan/ https://asiamedals.info/forums/keibodan-civil-defense-corps-badges.725/ Obverse 御視閲記念章 - Imperial Inspection Commemorative Badge reverse 昭和十七年十月 -...