See also https://asiamedals.info/threads/japanese-army-and-navy-officers-wives-association-meritorious-service-badge.28768/
1st variation /unmarked/.
Reverse
有功章 - Meritorious Service Badge
将校婦人會 - Officers' Wives Association
4th class meritorious service badge
army and navy officers' wives' associationbadge
greater japan officer's wifeassociationbadgejapan army&navy officer's wifeassociationbadgejapan officer's wifeassociationmeritbadgejapanese army and navy officers' wives associationjapanese army meritbadge
officer's wifeassociationmeritorious badge
大日本将校婦人会章
将校婦人会四等有功章
将校婦人会有功章
将校婦人会章
有功章