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/ ...
1940 unit no.428 service commemorative badge
1940年第四二八部隊在營記念章
badges of independent garrison units "kite design"
japanese badge
japanese imperial army badge
japanese independent garrison units badges
満国境出動記念章
独立守備隊記念章
琿春駐屯歩兵隊満国境出動記念章