Obverse
Imperial Military Reservist Association emblem https://asiamedals.info/forums/imperial-military-reservist-association-badges.611/ (see also https://asiamedals.info/threads/imperial-military-reservist-association-cufflinks-kafusubotan.24372)
reverse
日露戦役三十周年記念 - 30th Anniversary of the...
Obverse
此一戦 - [The Fate of the Empire] Depends on This Battle /At the Battle of Tsushima on May 27, 1905, Admiral Tōgō raised a Z flag on his flagship Mikasa. By prearrangement, this flag flown alone meant, "The fate of the Empire rests on the outcome of this battle. Let each man do his utmost/...
30thanniversaryoftherusso-japanesewaranniversaryoftherusso-japanesewar paperweight
japanese ministry ofthe navy paperweight
japanese paperweight
日露戰没三十周年記念
海軍省日露戰没三十周年記念文鎮
海軍省記念文鎮
30thanniversaryoftherusso-japanesewar
imperial military reservist association badge
japanese army badge
japanese military badge
帝国在郷軍人会章
帝国在郷軍人会紀念章
帝国在郷軍人会露戰勝参加参拾週年紀念章
Reverse
日露戦役三十周年記念 - 30th Anniversary of the Russo-Japanese War Commemorative
神奈川県 - Kanagawa Prefecture
横浜市 - Yokohama City
横須賀海軍入事部 - Yokosuka Navy Personnel Department
甲府聯隊区司令部 - Kofu Regimental District Headquarters
昭和十年 - 1935
Case (most likely it is not original to the badge).
記念 -...