Badge that could be easily confused with supporting member's badge https://asiamedals.info/threads/dainippon-air-defense-association-supporting-member-badge.23259/
Designs of both badges are identical, only reverse inscriptions are different.
Late war badge in light alloy and instead of...
See also badge issued by Ibaraki Prefecture Keibodan Branch https://asiamedals.info/threads/1943-greater-japan-civil-defense-association-ibaraki-branch-imperial-review-commemorative-badge.27225/
Size 35 x 28 mm.
Reverse
御視閲記念 - Imperial Review Commemorative
茨城縣支部 - Ibaraki Branch...
Obverse
功勞 - Merit
reverse
大日本防空協會 - Dainippon Air Defense Association
山梨縣支部 - Yamanashi Prefecture Branch
鰍澤部會 - Kajikazawa Town Branch of Association
Interesting that 部 is actually stamped over different kanji.
Case with label of Naigai Medal Co.
Badge size varies between 18 and 20 mm.
"Early" badges.
1st variation.
Reverse
賛助員會章 - Supporting Member of Association Badge
財團法人 - Foundation
大日本防空協會 - Dainippon Air Defense Association
Hot enamel + light metal alloy.
Original case.
Size 55 x 45 mm.
Another example of 1st...
great japanairdefenseassociationgreaterjapanairdefenseassociationbadgejapanese airdefenseassociationbadgejapanese airdefensebadgejapanese airdefense school badge
osaka airdefense school
osaka airdefense school badge
大阪防空学校
大阪防空学校章