91st Class of Utsunomiya Army Flight School Pilot Badge/宇都宮陸軍飛行学校第九十一期生陸軍飛行機操縦徽章

See also https://asiamedals.info/threads/uts...n-commemorative-watch-fobs.26684/#post-358924

Reverse

宇都宮 - Utsunomiya

陸軍飛行學校 - Army Flight School

第九十一期生 - 91st Class

Engraved

伊藤三郎 - Ito Saburo