Thanks to original paper wrapper we known that this is 遺族徽章 - Bereaved Family Badge from 栃木縣 - Tochigi Prefecture In the center of obverse 栃 - Tochi from 栃木- Tochigi
Reverse 東京歯科医学専門学校 - Tokyo Dental College 昭和八年十二月 - December 1933 Original case. Watch fob was made by Asahi workshop https://asiamedals.info/threads/badges-manufactured-by-asahi-medal-works-tokyo-asahi.21789/
Fire brigade commemorative badge made in commemoration of Imperial Inspection to the Gunma, Saitama, Tochige, Ibaraki, Nagano, Nigata and Chiba prefectures. November 16, 1934.
1st variation made by Hattori workshop in pure silver. High quality hot enamel. Marked 純銀 - pure silver. Reverse reads 有功章 - Merit Badge 海軍協會 - Navy League Original case. 紫色有功章 - Purple Merit Badge Typical clasp. Made by Hattori workshop...
Silver, enamel. Size 36.5 mm. Reverse (in Chinese) 日支化振興提携 - Japan-China Cultural Revitalization Support 皇紀二五九七年 - 1937 會同 - Assembly; Meeting 記念章 - Commemorative Medal/Badge 東亞文國教敍策委員會 - East Asian Cultural and National Education Policy Committee Member 純銀 - pure silver Ribbon.
Same design of obverse - different inscription on reverse. Reverse 名誉射撃優勝記念 - Honorary Shooting Victory Commemorative 歩兵第三聯隊 - 3rd Infantry Regiment 大正十年 - 1921 Another example that lost almost all of its silvering.
Introduced in November 17, 1939 in two variants: badge for the NCOs and badge for the privates. NCOs badge/下士官徽章 Original description. Soldier's badge/兵徽章 Both badges have several variations. NCO badge. Early variation in base metal.
Attack on Pearl Harbor commemorative watch fob. Salty specimen 必勝 / Hisshō / Certain Victory 真珠湾 - Pearl Harbor Reverse 大東亜戦争 - Greater East Asian War horizontally 記念 - Commemorative vertically ハワイ - Hawaii lower 海戦 - naval battle + date December 8, 1941 (interestingly...