Nagoya City Overtime Work Award Badge/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