This design was used for badges issued by Shitaya Ward to participants of air defense maneuvers in Kanto area during 1930s.
In 1936 badge with similar design was commissioned by Arakawa Ward Air Raid Defense Corps...
Supporting Member Badge.
Beautifully enamelled badge in silver.
Obverse
国防 - National Defense
reverse
関門北九州六市國防協會 - Kanomon Northern Kyushu 6 Cities National Defense Association
賛助會員 - Supporting Member