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...
1933kantolargeairdefensemaneuverswatchfob1933年関東防空演習参加章
badge made by naigai medal works
japanese airdefense badge
japanese airdefense corps badge
japanese airdefensemaneuvers badge
naigai medal works
takinogawa ward airdefense corps badge
takinogawa ward airdefense corps watchfob
内外徽章製作所
昭和8年関東防空演習参加章
瀧野川區防護團關東防空大演習参加メダル
瀧野川區防護團關東防空大演習参加章
関東防空演習参加メダル
關東防空大演習参加章