Photos courtesy of the owner.
Obverse
銃剣道 / Jūkendō / martial art using the bayonet literally "way of bayonet"
法大 -most likely abbreviation (for example it could be read as Hosei University)
greater japan association for promotion ofjukendo
japanese badge
japanese bayonet fighting badgejukendobadgemembershipbadgeassociationofjukendo
大日本銃剣道振興會法大章
銃剣道法大章
Dai Nippon Association for Promotion of Jukendo was established in 1941 and was dissolved in 1945.
After the war it was re-established in 1956 under the name All Japan Jukendo Federation.
https://ja.wikipedia.org/wiki/全日本銃剣道連盟
http://www.jukendo.info/jukendo-tankendo/jukendo
1st variant of...
greater japan association for promotion ofjukendo
japanese badge
japanese bayonet fighting badgemembershipbadgeassociationofjukendo
大日本銃剣道振興会
大日本銃剣道振興会会員章
大日本銃剣道振興會
大日本銃剣道振興會會員章