名古屋市四年昏勤賞章

See also https://asiamedals.info/threads/nagoya-city-one-year-perfect-attendance-award-badge.28723/ Late war ceramic badge. Obverse 勤 - Industrious; Diligent reverse 賞 - Award 四年 - Four Years 昏勤 - Late Work /lit. being late at work/ 名古屋市 - Nagoya City