japan air self-defenseforcebadges
japan self-defenseforces badges
japanese 3rd engineer brigade award watch fob
japaneseself-defenseforceawardbadge
jgsdf 3rd engineer brigade award watch fob
第3施設団賞メダル
第3施設団賞メダル章
第3施設団賞章
These badges/medals were manufactured by Nagawa workshop, Tokyo
https://asiamedals.info/threads/badges-watch-fobs-and-plaquettes-made-by-nagawa-medal-works.23299/
Three classes are known for today.
Blue ribbon = 5th class
Orange ribbon = 4th class
Green ribbon = 3rd class...