Badge that could be indirectly related to the family of Bereaved Family badges since Yasukuni Shrine was founded by Emperor Meiji in June 1869 to commemorate those who died in service of Japan, from the Boshin War of 1868–1869, to the two Sino-Japanese Wars, 1894–1895 and 1937–1945 respectively...
japanese bereaved family badgeyasukunishrinebadgeyasukunishrine eitai kagurabadgeyasukunishrineeternalkagurabadge
永代神楽之バッジ
永代神楽之徽章
靖国神社永代神楽之バッジ
靖国神社永代神楽徽章
See also https://asiamedals.info/threads/yasukuni-shrine-eitai-kagura-badge.30420/.
Reverse
靖国神社 - Yasukuni Shrine
永代神楽之徽章 - Eternal Kagura Badge
Original case.