Badges were introduced in 1880.
Original line drawing.
1st class badges "purple star".
1st variation.
Obverse
Symbol 〒 https://asiamedals.info/threads/symbol-of-japanese-post-yubin-maku-and-its-history.24108/
reverse
逓信省 - Ministry of Communications
Marked with Ando workshop mark...
japanese badge
japanese post badges
japanese post office diligent service badge
ministry of communications badge
ministry of communications diligent service badge
勤功章
壹級逓信省勤功章
逓信省勤功章
