These emblems are often passed off as (or mistaken for) embroidered versions of the japanese commander's badge https://asiamedals.info/forums/commander-badges.621/
Actually these are army NCO officer school collar badges /陸軍士官學校襟章/ that were introduced on October 20, 1943.
Original...
1st variation /horizontal pin/.
Size 50×35 mm.
Reverse
麻布聯隊區將校團 - Azabu Regimental District/Ward Commissioned Officer Corps
Azabu Regimental District was one of the regimental districts of the Imperial Japanese Army. Its predecessor was the Azabu Battalion District /established on May 14...