Famous Tokyo workshop https://asiamedals.info/threads/history-labels-i-marks-of-hattori-watch-shop-tokyo.19361
Badges made by Hattori&Co usually marked with "Martlet" and "KH" or "K.H." for Kintaro Hattori.
Cased specimen.
海軍 - Naval
大學卒業徽章 - Academy Graduation Badge
badgemadebyhattori workshop
hattori watch shop
hattori workshop
imperial japanese navy academygraduationbadge
japanese navalacademygraduationbadge
japanese naval war college badgenavalacademygraduationbadgenavalacademygraduationbadgemadebyhattori
卒業徽章
海軍大学校卒業徽章
海軍大學卒業徽章