Joint Japan-Manchukuo Air Defense Badges

1st design pattern.

1st variation.

Obverse

防空 - Air Defense

 

2nd variation (by stamp and enamels).

Size 17 mm.

 

Additional examples of 2nd variation.

 

2nd design pattern.

Reverse is plain.

 

Very same badge at the postcard from 1935.

Mukden Air Defense Maneuvers in Manchukuo.
"Military & civilian to unite for the air defense!"

 

3rd design pattern.