Matsubara Unit Badge.
"Kite Design" Independent Garrison Units Commemorative Badges/独立守備隊記念章
See also these badges with similar design https://asiamedals.info/threads/manchurian-incident-commemorative-badges-and-watch-fobs.23177/page-3#post-349361; https://asiamedals.info/threads/badges-and-watch-fobs-of-kwantung-army-flying-corps.20131/ ...
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