See also https://asiamedals.info/threads/7th-class-of-yokaren-program-graduation-commemorative-watch-fob.29020/.
Size 50x46 mm.
Obverse
飛 for 飛[行練習生] - Flight [Trainee]
reverse
reverse
Yokaren program emblem /In 1928, a new program was created to enable civilian population to enter the...
1941年第21期飛行練習生章
21st naval pilot training class watchfobjapanese naval pilot graduation watchfobjapanesenavyaviation badge
japanesenavyaviationwatchfob
naval pilot 1941 graduation watchfob
昭和16年第二十一期飛行練習生章
皇紀2601第二十一期飛行練習生卒業記念章