Undefinable Air Defense Badges

Badges of this "family" bear only

防空 - Air Defense

or

国防 - National Defense


1st stamp variation.

2nd stamp variation.

 

In addition to

防空 - Air Defense

badge has

記念 - Commemorative

 

This time national defense - 国防 written in old style 國防.

 

防空 - Air Defense

 

Obverse

防空参加 - Air Defense Participation

功勞 - Merit

 

防空 - Air Defense

In the center 青 - Youth [for Youth League]