Reverse
同仁 - Doujin https://asiamedals.info/threads/doujinkai-history-badges-and-documents.29449/
Original "jewelry" type case without inscription /or inscription was erased/.
Badges were manufactured by the Kobayashi workshop in Tokyo /東京 小林製/.
東京 - Tokyo
D.K. in rhombus
小林製 - Made by Kobayashi https://asiamedals.info/threads/bad...a-items-made-by-d-kobayashi-watch-shop.29462/