Japanese Army Pilot Badges with reverse inscription "Army Military Aircraft Piloting Mastery Badge/陸軍軍用機操縦術修得徽章"

Manufacturer (as well as time of production) is unknown. Most likely quality post war replicas.

Size 54×37 mm.

All such badges have same inscription at reverse

陸軍軍用機 - Army Military Aircraft

操縦術修得徽章 - Piloting Mastery Badge

 

Another example. Pin is lost.