Size 40 mm.
Obverse
日本練習艦隊 - Japanese Training Squadron
Original case.
Watch fobs were manufactured by the Yamazaki shōten workshop https://asiamedals.info/threads/badges-watch-fobs-medals-and-cups-of-yamazaki-shoten.23561/
1966 japanese training squadron watch fob
1966年日本練習艦隊記念章
badge made by yamazaki shōten
japanese naval training squadron badge
watch fob made yamazaki shōten
山崎商店