3rd class merit badge.
Size 54 x 36.4 mm.
Obverse
功勞 - Merit
青 - Youth
reverse
小石川区青年團 - Koishikawa Ward Youth League
昭和六年二月十一日 - February 11, 1931
三等 - 3rd class
Case.
Badges were made by the Masuda workshop...
See also badge made by the same workshop with a similar design https://asiamedals.info/threads/hyogo-prefecture-education-society-merit-badge.26388/
Obverse
功勞章 - Merit badge
Reverse
大阪府 - Osaka prefecture
聯合青年團 - Youth League
Marked
SBD (for Shobido workshop, Osaka...