開成グッズ【開成学園 中学 襟章 校章 バッジ】Metal lapel badges to be attached to student uniforms at Kaisei junior High School

開成中学の学生服の襟に取り付ける生徒専用の襟章です。
開成学園の在籍者向けの販売ですので、一般の方には手に入りにくいと思います。

This is a student-specific lapel badge that attaches to the collar of the student uniform of Kaisei Junior High School.
It is sold to enrolled students of Kaisei Gakuen, so it is not readily available to the general public.
The school has been ranked number one for 42 consecutive years for those who have been accepted to University of Tokyo, and is probably one of the big three most prestigious schools in Japan.