See also https://asiamedals.info/threads/china-incident-commemorative-badges-and-watch-fobs.22957/page-3#post-211452
Obverse
Inside the flag 警 for 警備 - Security /policing; guard/
漢口警備記念 - Hankou Security /policing; guard/ Commemorative (Hankou was one of the three towns (the other two...
1941 hankou security commemorativewatchfob1941toriiunitcommemorativewatchfob1941toriiunit hankou security watchfob1941年鳥居部隊漢口警備記念章
japanese army badge
japanese imperial army watchfob
鳥居部隊漢口警備記念メダル