About Hattori workshop see https://asiamedals.info/threads/history-labels-i-marks-of-hattori-watch-shop-tokyo.19361
1st variation "mark KH"
Mark.
KH for Kintaro Hattori and small martlet mark.
Case.
陸軍大學校卒業徽章 - Army War College Graduation Badge
Early badges from Meiji era.
Silver, gilt.
Size 43.5 x 35.3 mm.
35.3 mm x 43.5 mm
Engraved
川原 - Kawahara
Original case.
Case dimensions 62 x 73.8 x 28 mm.
陸軍大學校卒業徽章 - Army War College Graduation Badge