See also https://asiamedals.info/threads/1905-japan-seafarers-relief-association-prince-arisugawa-takehito-commemorative-watch-fob-1905.26363/
Size 58 mm.
Thickness 4 mm.
Weight 75g.
Obverse
總裁威仁親王 - Prince Arisugawa Takehito
reverse
帝國軍人後援會記念 - Imperial Soldiers' Relief Association...