1936.
Obverse
Post office emblem https://asiamedals.info/forums/ministry-of-communications-post-office-badges.632/
勤績 - Attendance/Long Service
reverse
昭和十一年十月一日 - October 1, 1936 (date engraved)
勤績章 - Attendance Badge
朝鮮總督府 - Governor-General of Korea
Marked 純銀 - pure silver.
Obverse
Post office emblem https://asiamedals.info/forums/ministry-of-communications-post-office-badges.632/
勤績 - Attendance/Long Service
reverse
昭和十一年十月一日 - October 1, 1936 (date engraved)
勤績章 - Attendance Badge
朝鮮總督府 - Governor-General of Korea
Marked 純銀 - pure silver.