偵察第八十二期 下士官操縦徽章

Reverse 偵察第八十二期 - Reconnaissance 82nd Class Engraved 大岩 - Ōiwa (second kanji could be typo see https://asiamedals.info/threads/graduation-commemorative-watch-fobs-of-utsunomiya-army-flight-school.23736/) Original case. 下士官操縦徽章 - NCO Pilot Badge.