Nicely designed watch fob after army pilot badge https://asiamedals.info/forums/army-pilot-badges.613/
Obverse
無線 - Wireless
reverse
皇紀2601年 - 1941
陸軍少年飛行兵第四期 - Army Youth Airmen 4th Term/Class
陸軍航空通信學校 - Army Aviation Signal School
Engraved
氏名岡村三四吉 - Full name: Sanshikichi Okamura...
armyaviation communication schoolwatchfobjapanesearmyaviation communication school badge
japanesearmyaviationschool graduation badge
japanesearmyaviationsignalschool badge
japanesearmyaviationsignalschoolwatchfobjapanesearmyaviationwatchfob
日本陸軍航空通信学校章
imperial army of japan badge
japanesearmyaviationsignalschool badge
japanesearmyaviationsignalschoolwatchfobjapaneseaviationschool graduation badge
japaneseaviationschool graduation watchfobsignalschool instructor corps watchfob
陸軍航空通信学校教導隊章
陸軍航空通信学校章