1935 badge https://asiamedals.info/threads/1935-toshima-ward-air-raid-defense-corps-ikebukuro-no-4-branch-establishment-commemorative-badge-1935.30268/.
See also https://asiamedals.info/threads/toshima-ward-takada-no-5-branch-of-air-raid-defense-corps-merit-badge.24945/ ...
1937 toshima ward air raid defense corps badge
1937年池袋第二分團豊島區防護團有功章
badge made by takayama medals
japanese air defense badge
japanese air defense corps badge
takayama medals workshop
高山徽章商會
