Established in September 1936 and integrated into Manchurian Air Affairs Association in August 1939 https://asiamedals.info/threads/badges-of-manchukuo-air-defense-association.23617/#post-348839
Therefore all badges of Manchukuo Aviation Association belong to the very narrow time period...
See also badge with a similar design https://asiamedals.info/threads/imperial-railway-association-1936-dairen-general-meeting-commemorative-badge.24377/
Suspension
満州能率大會 - Manchuria Productivity/Efficiency Convention
In the center of the badge
能率 - Productivity/Efficiency
Reverse of...
badge manchukuo
badge with flags of manchukuo and japan
badge with manchukuo flag
japanesebadgejapanesepuppetstatebadge
manchukuo badge
manchukuo-japan friendship
manchukuo-japan friendship badge
満州国バッジ
満州国徽章